diff --git a/src/teaching/cse-250/2022fa/index.erb b/src/teaching/cse-250/2022fa/index.erb
index c7245c6a..39a93e04 100644
--- a/src/teaching/cse-250/2022fa/index.erb
+++ b/src/teaching/cse-250/2022fa/index.erb
@@ -507,17 +507,25 @@ schedule:
       due: PA4
       topic: Wrap-Up / Review
       dow: Mon
+      section_b:
+        slides: slide/37b-Review1.pdf
     - date: 12/07/22
       topic: Wrap-Up / Review
       dow: Wed
+      section_b:
+        slides: slide/38b-Review2.pdf
     - date: 12/09/22
       topic: Wrap-Up / Review
       dow: Fri
       due: WA4
+      section_b:
+        slides: slide/39b-Review3.pdf
   - week: Exam
     lectures:
-    - date: ???
+    - date: 12/12/22
       special: Final Exam
+      links:
+        2021_Fall: ../exams/2021fa_midterm.pdf
 ---
 <style>
 p {
diff --git a/src/teaching/cse-250/2022fa/slide/37b-Review1.pdf b/src/teaching/cse-250/2022fa/slide/37b-Review1.pdf
new file mode 100644
index 00000000..e0464b48
Binary files /dev/null and b/src/teaching/cse-250/2022fa/slide/37b-Review1.pdf differ
diff --git a/src/teaching/cse-250/2022fa/slide/38b-Review2.pdf b/src/teaching/cse-250/2022fa/slide/38b-Review2.pdf
new file mode 100644
index 00000000..4c41e1ca
Binary files /dev/null and b/src/teaching/cse-250/2022fa/slide/38b-Review2.pdf differ
diff --git a/src/teaching/cse-250/2022fa/slide/39b-Review3.pdf b/src/teaching/cse-250/2022fa/slide/39b-Review3.pdf
new file mode 100644
index 00000000..d39c0a21
Binary files /dev/null and b/src/teaching/cse-250/2022fa/slide/39b-Review3.pdf differ
diff --git a/src/teaching/cse-250/2022fa/slide/graphics/36b/kdtree.svg b/src/teaching/cse-250/2022fa/slide/graphics/36b/kdtree.svg
new file mode 100644
index 00000000..3f956f91
--- /dev/null
+++ b/src/teaching/cse-250/2022fa/slide/graphics/36b/kdtree.svg
@@ -0,0 +1,754 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="398.57489mm"
+   height="200.27249mm"
+   viewBox="0 0 398.57489 200.27249"
+   version="1.1"
+   id="svg5"
+   inkscape:version="1.1.2 (0a00cf5339, 2022-02-04)"
+   sodipodi:docname="kdtree.svg"
+   inkscape:export-filename="/home/okennedy/quadtree11.png"
+   inkscape:export-xdpi="95.868896"
+   inkscape:export-ydpi="95.868896"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <sodipodi:namedview
+     id="namedview7"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:pageshadow="2"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="0"
+     inkscape:document-units="mm"
+     showgrid="false"
+     inkscape:lockguides="true"
+     inkscape:zoom="0.5"
+     inkscape:cx="708"
+     inkscape:cy="326"
+     inkscape:window-width="1920"
+     inkscape:window-height="1011"
+     inkscape:window-x="1080"
+     inkscape:window-y="352"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="layer10">
+    <inkscape:grid
+       type="xygrid"
+       id="grid824"
+       originx="0"
+       originy="0" />
+  </sodipodi:namedview>
+  <defs
+     id="defs2" />
+  <g
+     inkscape:label="Layer 1"
+     inkscape:groupmode="layer"
+     id="layer1">
+    <rect
+       style="fill:#000000;fill-opacity:0;stroke:#241f31;stroke-width:0.264999;stroke-linejoin:round"
+       id="rect33523"
+       width="200"
+       height="200"
+       x="0.1324995"
+       y="0.1324995" />
+  </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer2"
+     inkscape:label="Layer 2"
+     style="display:inline">
+    <g
+       id="g9647"
+       transform="translate(-3.7552834,-30.604008)">
+      <circle
+         style="fill:#c0bfbc;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle9641"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text9645"><tspan
+           sodipodi:role="line"
+           id="tspan9643"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(16,97)</tspan></text>
+    </g>
+    <g
+       id="g21502"
+       transform="translate(32.244718,-0.60400816)">
+      <circle
+         style="fill:#c0bfbc;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle21496"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text21500"><tspan
+           sodipodi:role="line"
+           id="tspan21498"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(34,82)</tspan></text>
+    </g>
+    <g
+       id="g21622"
+       transform="translate(64.244717,-2.6040082)">
+      <circle
+         style="fill:#c0bfbc;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle21616"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text21620"><tspan
+           sodipodi:role="line"
+           id="tspan21618"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(50,83)</tspan></text>
+    </g>
+    <g
+       id="g21606"
+       transform="translate(36.244718,31.395993)">
+      <circle
+         style="fill:#c0bfbc;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle21600"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text21604"><tspan
+           sodipodi:role="line"
+           id="tspan21602"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(36,66)</tspan></text>
+    </g>
+    <g
+       id="g16611"
+       transform="translate(88.244717,33.395991)">
+      <circle
+         style="fill:#c0bfbc;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle16605"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text16609"><tspan
+           sodipodi:role="line"
+           id="tspan16607"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(62,65)</tspan></text>
+    </g>
+    <g
+       id="g21614"
+       transform="translate(96.244717,51.395992)">
+      <circle
+         style="fill:#c0bfbc;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle21608"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text21612"><tspan
+           sodipodi:role="line"
+           id="tspan21610"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(66,56)</tspan></text>
+    </g>
+    <g
+       id="g17856"
+       transform="translate(52.244718,79.395992)">
+      <circle
+         style="fill:#c0bfbc;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle17850"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text17854"><tspan
+           sodipodi:role="line"
+           id="tspan17852"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(44,42)</tspan></text>
+    </g>
+    <g
+       id="g21598"
+       transform="matrix(1.0000011,0,0,1,-7.7553227,121.39599)">
+      <circle
+         style="fill:#c0bfbc;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle21592"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text21596"><tspan
+           sodipodi:role="line"
+           id="tspan21594"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(14,21)</tspan></text>
+    </g>
+    <g
+       id="g9639"
+       transform="translate(144.24472,109.39599)">
+      <circle
+         style="fill:#c0bfbc;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="path850"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text2944"><tspan
+           sodipodi:role="line"
+           id="tspan2942"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(90,27)</tspan></text>
+    </g>
+    <g
+       id="g21630"
+       transform="translate(84.244717,135.39599)">
+      <circle
+         style="fill:#c0bfbc;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle21624"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text21628"><tspan
+           sodipodi:role="line"
+           id="tspan21626"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(60,14)</tspan></text>
+    </g>
+  </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer4"
+     inkscape:label="Layer 3"
+     style="display:inline">
+    <circle
+       style="display:inline;fill:#c01c28;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+       id="circle17850-3"
+       cx="92.98851"
+       cy="127.74992"
+       r="4.8799314" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 93.043555,0.19855775 V 200.19856"
+       id="path36333" />
+    <g
+       id="g17856-7"
+       transform="matrix(1.2531725,0,0,1.2531725,237.49459,-28.331313)"
+       style="display:inline">
+      <circle
+         style="fill:#c01c28;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle17850-5"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text17854-3"><tspan
+           sodipodi:role="line"
+           id="tspan17852-5"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(44,42)</tspan><tspan
+           sodipodi:role="line"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="47.942497"
+           id="tspan53022">  x &lt; 44?</tspan></text>
+    </g>
+  </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer5"
+     inkscape:label="Layer 4"
+     style="display:inline">
+    <circle
+       style="display:inline;fill:#f6d32d;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+       id="circle37585"
+       cx="137.03627"
+       cy="99.779259"
+       r="4.8799314" />
+    <g
+       id="g21598-6"
+       transform="matrix(1.2531739,0,0,1.2531725,190.7429,12.128916)"
+       style="display:inline">
+      <circle
+         style="fill:#ff7800;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle21592-2"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text21596-9"><tspan
+           sodipodi:role="line"
+           id="tspan21594-1"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(33,66)</tspan><tspan
+           sodipodi:role="line"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="47.942497"
+           id="tspan53730">   y &lt; 66?</tspan></text>
+    </g>
+    <ellipse
+       style="display:inline;fill:#ff7800;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+       id="circle36671"
+       cx="76.974411"
+       cy="79.766281"
+       rx="4.8799367"
+       ry="4.8799314" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 92.979848,79.714092 H 0.22571807"
+       id="path36694"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.331568px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 284.79274,37.117453 245.98592,68.104039"
+       id="path37796"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 200.02148,99.822423 H 92.979848"
+       id="path43802"
+       sodipodi:nodetypes="cc" />
+    <g
+       id="g21502-2"
+       transform="matrix(1.2531725,0,0,1.2531725,283.22877,11.940528)"
+       style="display:inline">
+      <circle
+         style="fill:#f6d32d;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle21496-7"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text21500-0"><tspan
+           sodipodi:role="line"
+           id="tspan21498-9"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(66,56)</tspan><tspan
+           sodipodi:role="line"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="47.942497"
+           id="tspan56256">   y &lt; 56?</tspan></text>
+    </g>
+    <path
+       style="display:inline;fill:none;stroke:#000000;stroke-width:0.331568px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 291.49428,37.117453 330.3011,68.104039"
+       id="path49957"
+       sodipodi:nodetypes="cc" />
+  </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer6"
+     inkscape:label="Layer 5"
+     style="display:inline">
+    <circle
+       style="display:inline;fill:#613583;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+       id="circle37679"
+       cx="28.087431"
+       cy="22.595182"
+       r="4.8799314"
+       transform="matrix(1.2531725,0,0,1.2531725,181.22514,78.624975)" />
+    <text
+       xml:space="preserve"
+       style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;display:inline;stroke-width:0.264583"
+       x="30.974398"
+       y="15.128986"
+       id="text37683"
+       transform="matrix(1.2531725,0,0,1.2531725,181.22514,78.624975)"><tspan
+         sodipodi:role="line"
+         id="tspan37681"
+         style="stroke-width:0.264583"
+         x="30.974398"
+         y="15.128986">(14,21)</tspan><tspan
+         sodipodi:role="line"
+         style="stroke-width:0.264583"
+         x="30.974398"
+         y="22.184536"
+         id="tspan69510">   x &lt; 14?</tspan></text>
+    <circle
+       style="display:inline;fill:#613583;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+       id="circle37703"
+       cx="33.028946"
+       cy="169.80838"
+       r="4.8799314" />
+    <path
+       style="display:inline;fill:none;stroke:#000000;stroke-width:0.331568px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 238.14716,77.490255 219.22552,101.41206"
+       id="path38183" />
+    <path
+       style="display:inline;fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 33.184007,79.714092 V 200.0425"
+       id="path38807"
+       sodipodi:nodetypes="cc" />
+  </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer7"
+     inkscape:label="Layer 6"
+     style="display:inline">
+    <g
+       id="g37685"
+       transform="matrix(1.2531725,0,0,1.2531725,181.22514,78.624975)"
+       style="display:inline" />
+    <g
+       id="g37693"
+       transform="matrix(1.2531725,0,0,1.2531725,211.15446,78.533644)"
+       style="display:inline">
+      <circle
+         style="fill:#cdab8f;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle37687"
+         cx="40.038876"
+         cy="22.777283"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="42.925846"
+         y="15.311087"
+         id="text37691"><tspan
+           sodipodi:role="line"
+           id="tspan37689"
+           style="stroke-width:0.264583"
+           x="42.925846"
+           y="15.311087">(16,97)</tspan><tspan
+           sodipodi:role="line"
+           style="stroke-width:0.264583"
+           x="42.925846"
+           y="22.366636"
+           id="tspan70376">   x &lt; 16?</tspan></text>
+    </g>
+    <circle
+       style="display:inline;fill:#cdab8f;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+       id="circle37706"
+       cx="40.755283"
+       cy="48.353146"
+       r="4.8799314"
+       transform="translate(-3.7552834,-30.604008)" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.331568px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="m 245.51088,77.557024 16.57717,23.325866"
+       id="path38185"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 92.804887,79.880809 H 72.047137"
+       id="path38809"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="display:inline;fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 37.140367,0.13576735 V 79.662509"
+       id="path39220"
+       sodipodi:nodetypes="cc" />
+  </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer8"
+     inkscape:label="Layer 7"
+     style="display:inline">
+    <g
+       id="g38377"
+       transform="matrix(1.2531725,0,0,1.2531725,216.58911,87.438145)"
+       style="display:inline">
+      <circle
+         style="fill:#63452c;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle38371"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text38375"><tspan
+           sodipodi:role="line"
+           id="tspan38373"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(34,82)</tspan><tspan
+           sodipodi:role="line"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="47.942497"
+           id="tspan71205">   y &lt; 82?</tspan></text>
+    </g>
+    <circle
+       style="display:inline;fill:#63452c;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+       id="circle38383"
+       cx="72.998413"
+       cy="47.781551"
+       r="4.8799314" />
+    <path
+       style="display:inline;fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 93.102967,47.876196 H 36.819593"
+       id="path39519"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.331568px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="m 262.02226,113.07083 4.98115,28.65291"
+       id="path39612" />
+  </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer9"
+     inkscape:label="Layer 8"
+     style="display:inline">
+    <g
+       id="g39701"
+       transform="matrix(1.2531725,0,0,1.2531725,304.21217,46.562261)"
+       style="display:inline">
+      <circle
+         style="fill:#62a0ea;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle39695"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text39699"><tspan
+           sodipodi:role="line"
+           id="tspan39697"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(50,83)</tspan><tspan
+           sodipodi:role="line"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="47.942497"
+           id="tspan75596">   x &lt; 50</tspan></text>
+    </g>
+    <g
+       id="g39709"
+       transform="matrix(1.2531725,0,0,1.2531725,256.94365,46.505527)"
+       style="display:inline">
+      <circle
+         style="fill:#1a5fb4;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle39703"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text39707"><tspan
+           sodipodi:role="line"
+           id="tspan39705"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(90,27)</tspan><tspan
+           sodipodi:role="line"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="47.942497"
+           id="tspan73220">   x &lt; 90?</tspan></text>
+    </g>
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.331568px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 330.23335,77.177308 308.12557,100.88289"
+       id="path39752"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.331568px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="m 338.48316,77.18841 15.67993,23.69448"
+       id="path39754"
+       sodipodi:nodetypes="cc" />
+    <circle
+       style="display:inline;fill:#1a5fb4;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+       id="circle39836"
+       cx="184.9897"
+       cy="157.77292"
+       r="4.8799314" />
+    <circle
+       style="display:inline;fill:#62a0ea;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+       id="circle39839"
+       cx="40.755283"
+       cy="48.353146"
+       r="4.8799314"
+       transform="translate(64.244717,-2.6040082)" />
+    <path
+       style="display:inline;fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 105.08309,0.13576735 V 99.962514"
+       id="path39936"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="display:inline;fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 185.05491,99.822423 V 200.27249"
+       id="path39932"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="display:inline;fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 200.22572,99.905073 H 128.95629"
+       id="path39934"
+       sodipodi:nodetypes="cc" />
+  </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer10"
+     inkscape:label="Layer 9"
+     style="display:inline">
+    <g
+       id="g40546"
+       transform="matrix(1.2531725,0,0,1.2531725,241.99319,104.39371)"
+       style="display:inline">
+      <circle
+         style="fill:#26a269;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle40540"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text40544"><tspan
+           sodipodi:role="line"
+           id="tspan40542"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(60,14)</tspan><tspan
+           sodipodi:role="line"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="47.942497"
+           id="tspan82851">   y &lt; 14?</tspan></text>
+    </g>
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.331568px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="m 304.18817,112.20004 -9.32864,47.12223"
+       id="path40585"
+       sodipodi:nodetypes="cc" />
+    <circle
+       style="display:inline;fill:#26a269;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+       id="circle40724"
+       cx="40.755283"
+       cy="48.353146"
+       r="4.8799314"
+       transform="translate(84.244717,135.39599)" />
+    <path
+       style="display:inline;fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 184.87989,183.51349 H 93.359051"
+       id="path40783"
+       sodipodi:nodetypes="cc" />
+    <circle
+       style="display:inline;fill:#8ff0a4;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+       id="circle81662"
+       cx="129.04031"
+       cy="81.744591"
+       r="4.8799314" />
+    <g
+       id="g81967"
+       transform="matrix(1.2531725,0,0,1.2531725,318.72242,104.39371)"
+       style="display:inline">
+      <circle
+         style="fill:#8ff0a4;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle81961"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text81965"><tspan
+           sodipodi:role="line"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948"
+           id="tspan83851">(62,65)</tspan><tspan
+           sodipodi:role="line"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="47.942497"
+           id="tspan83857">   y &lt; 65?</tspan></text>
+    </g>
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.331568px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="m 358.35957,112.20004 9.32864,47.12223"
+       id="path81969"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="display:inline;fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 200.3081,81.746937 H 105.08309"
+       id="path85363"
+       sodipodi:nodetypes="cc" />
+  </g>
+</svg>
diff --git a/src/teaching/cse-250/2022fa/slide/graphics/36b/quadtree.svg b/src/teaching/cse-250/2022fa/slide/graphics/36b/quadtree.svg
new file mode 100644
index 00000000..1f99d673
--- /dev/null
+++ b/src/teaching/cse-250/2022fa/slide/graphics/36b/quadtree.svg
@@ -0,0 +1,791 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="390.36133mm"
+   height="200.265mm"
+   viewBox="0 0 390.36133 200.265"
+   version="1.1"
+   id="svg5"
+   inkscape:version="1.1.2 (0a00cf5339, 2022-02-04)"
+   sodipodi:docname="quadtree.svg"
+   inkscape:export-filename="/home/okennedy/quadtree11.png"
+   inkscape:export-xdpi="95.868896"
+   inkscape:export-ydpi="95.868896"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <sodipodi:namedview
+     id="namedview7"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:pageshadow="2"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="0"
+     inkscape:document-units="mm"
+     showgrid="false"
+     inkscape:lockguides="true"
+     inkscape:zoom="0.65235614"
+     inkscape:cx="813.97257"
+     inkscape:cy="191.61313"
+     inkscape:window-width="1920"
+     inkscape:window-height="1011"
+     inkscape:window-x="1080"
+     inkscape:window-y="352"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="layer12">
+    <inkscape:grid
+       type="xygrid"
+       id="grid824"
+       originx="0"
+       originy="0" />
+  </sodipodi:namedview>
+  <defs
+     id="defs2" />
+  <g
+     inkscape:label="Layer 1"
+     inkscape:groupmode="layer"
+     id="layer1">
+    <rect
+       style="fill:#000000;fill-opacity:0;stroke:#241f31;stroke-width:0.264999;stroke-linejoin:round"
+       id="rect33523"
+       width="200"
+       height="200"
+       x="0.1324995"
+       y="0.1324995" />
+  </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer2"
+     inkscape:label="Layer 2"
+     style="display:inline">
+    <g
+       id="g9647"
+       transform="translate(-3.7552834,-30.604008)">
+      <circle
+         style="fill:#c0bfbc;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle9641"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text9645"><tspan
+           sodipodi:role="line"
+           id="tspan9643"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(16,97)</tspan></text>
+    </g>
+    <g
+       id="g21502"
+       transform="translate(32.244718,-0.60400816)">
+      <circle
+         style="fill:#c0bfbc;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle21496"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text21500"><tspan
+           sodipodi:role="line"
+           id="tspan21498"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(34,82)</tspan></text>
+    </g>
+    <g
+       id="g21622"
+       transform="translate(64.244717,-2.6040082)">
+      <circle
+         style="fill:#c0bfbc;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle21616"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text21620"><tspan
+           sodipodi:role="line"
+           id="tspan21618"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(50,83)</tspan></text>
+    </g>
+    <g
+       id="g21606"
+       transform="translate(36.244718,31.395993)">
+      <circle
+         style="fill:#c0bfbc;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle21600"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text21604"><tspan
+           sodipodi:role="line"
+           id="tspan21602"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(36,66)</tspan></text>
+    </g>
+    <g
+       id="g16611"
+       transform="translate(88.244717,33.395991)">
+      <circle
+         style="fill:#c0bfbc;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle16605"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text16609"><tspan
+           sodipodi:role="line"
+           id="tspan16607"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(62,65)</tspan></text>
+    </g>
+    <g
+       id="g21614"
+       transform="translate(96.244717,51.395992)">
+      <circle
+         style="fill:#c0bfbc;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle21608"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text21612"><tspan
+           sodipodi:role="line"
+           id="tspan21610"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(66,56)</tspan></text>
+    </g>
+    <g
+       id="g17856"
+       transform="translate(52.244718,79.395992)">
+      <circle
+         style="fill:#c0bfbc;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle17850"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text17854"><tspan
+           sodipodi:role="line"
+           id="tspan17852"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(44,42)</tspan></text>
+    </g>
+    <g
+       id="g21598"
+       transform="matrix(1.0000011,0,0,1,-7.7553227,121.39599)">
+      <circle
+         style="fill:#c0bfbc;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle21592"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text21596"><tspan
+           sodipodi:role="line"
+           id="tspan21594"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(14,21)</tspan></text>
+    </g>
+    <g
+       id="g9639"
+       transform="translate(144.24472,109.39599)">
+      <circle
+         style="fill:#c0bfbc;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="path850"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text2944"><tspan
+           sodipodi:role="line"
+           id="tspan2942"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(90,27)</tspan></text>
+    </g>
+    <g
+       id="g21630"
+       transform="translate(84.244717,135.39599)">
+      <circle
+         style="fill:#c0bfbc;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle21624"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text21628"><tspan
+           sodipodi:role="line"
+           id="tspan21626"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(60,14)</tspan></text>
+    </g>
+  </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer4"
+     inkscape:label="Layer 3"
+     style="display:inline">
+    <circle
+       style="display:inline;fill:#c01c28;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+       id="circle17850-3"
+       cx="92.98851"
+       cy="127.74992"
+       r="4.8799314" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 93.043555,0.19855775 V 200.19856"
+       id="path36333" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 200.22572,127.95094 H 0.22571807"
+       id="path36333-6" />
+    <g
+       id="g17856-7"
+       transform="matrix(1.2531725,0,0,1.2531725,237.49459,3.4186882)"
+       style="display:inline">
+      <circle
+         style="fill:#c01c28;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle17850-5"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text17854-3"><tspan
+           sodipodi:role="line"
+           id="tspan17852-5"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(44,42)</tspan></text>
+    </g>
+  </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer5"
+     inkscape:label="Layer 4"
+     style="display:inline">
+    <g
+       id="g21598-6"
+       transform="matrix(1.2531739,0,0,1.2531725,169.57622,43.878918)"
+       style="display:inline">
+      <circle
+         style="fill:#ff7800;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle21592-2"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text21596-9"><tspan
+           sodipodi:role="line"
+           id="tspan21594-1"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(14,21)</tspan></text>
+    </g>
+    <circle
+       style="display:inline;fill:#ff7800;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+       id="circle36671"
+       cx="40.755283"
+       cy="48.353146"
+       r="4.8799314"
+       transform="matrix(1.0000011,0,0,1,-7.7553227,121.39599)" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="m 32.838067,127.95837 v 72.24019"
+       id="path36692"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 92.979848,169.75513 H 0.22571807"
+       id="path36694"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.331568px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 284.79274,68.867455 224.81925,99.854041"
+       id="path37796"
+       sodipodi:nodetypes="cc" />
+  </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer6"
+     inkscape:label="Layer 5"
+     style="display:inline">
+    <circle
+       style="display:inline;fill:#f6d32d;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+       id="circle37585"
+       cx="40.755283"
+       cy="48.353146"
+       r="4.8799314"
+       transform="translate(32.244718,-0.60400816)" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 72.803916,0.13576735 V 127.87251"
+       id="path37201"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 92.804887,47.746882 H 0.22571807"
+       id="path37203"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.331568px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 286.11901,69.530592 260.50152,99.545099"
+       id="path37798"
+       sodipodi:nodetypes="cc" />
+    <g
+       id="g21502-2"
+       transform="matrix(1.2531725,0,0,1.2531725,206.19845,43.910755)"
+       style="display:inline">
+      <circle
+         style="fill:#f6d32d;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle21496-7"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text21500-0"><tspan
+           sodipodi:role="line"
+           id="tspan21498-9"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(34,82)</tspan></text>
+    </g>
+  </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer7"
+     inkscape:label="Layer 6"
+     style="display:inline">
+    <g
+       id="g37685"
+       transform="matrix(1.2531725,0,0,1.2531725,181.22514,78.624975)"
+       style="display:inline">
+      <circle
+         style="fill:#986a44;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle37679"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text37683"><tspan
+           sodipodi:role="line"
+           id="tspan37681"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(16,97)</tspan></text>
+    </g>
+    <g
+       id="g37693"
+       transform="matrix(1.2531725,0,0,1.2531725,211.15446,78.533644)"
+       style="display:inline">
+      <circle
+         style="fill:#986a44;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle37687"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text37691"><tspan
+           sodipodi:role="line"
+           id="tspan37689"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(36,66)</tspan></text>
+    </g>
+    <circle
+       style="display:inline;fill:#986a44;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+       id="circle37703"
+       cx="40.755283"
+       cy="48.353146"
+       r="4.8799314"
+       transform="translate(36.244718,31.395993)" />
+    <circle
+       style="display:inline;fill:#986a44;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+       id="circle37706"
+       cx="40.755283"
+       cy="48.353146"
+       r="4.8799314"
+       transform="translate(-3.7552834,-30.604008)" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.331568px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="m 254.02217,109.76943 -18.92164,23.92182"
+       id="path38183" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.331568px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="m 260.47967,109.97085 2.50613,22.96301"
+       id="path38185" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 77.037252,47.760767 V 127.87251"
+       id="path38807"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 92.804887,79.880809 H 72.047137"
+       id="path38809"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="display:inline;fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 37.140367,0.13576735 V 47.623016"
+       id="path39220"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="display:inline;fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 72.696554,17.904167 H 0.22571807"
+       id="path39222"
+       sodipodi:nodetypes="cc" />
+  </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer8"
+     inkscape:label="Layer 7"
+     style="display:inline">
+    <g
+       id="g38377"
+       transform="matrix(1.2531725,0,0,1.2531725,245.93648,43.717669)"
+       style="display:inline">
+      <circle
+         style="fill:#9141ac;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle38371"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text38375"><tspan
+           sodipodi:role="line"
+           id="tspan38373"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(62,65)</tspan></text>
+    </g>
+    <circle
+       style="display:inline;fill:#9141ac;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+       id="circle38383"
+       cx="40.755283"
+       cy="48.353146"
+       r="4.8799314"
+       transform="translate(88.244717,33.395991)" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 128.89562,0.13576735 V 127.87251"
+       id="path38686"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="display:inline;fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 200.22572,81.913423 H 93.042157"
+       id="path39519"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.331568px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="m 291.36963,69.350367 4.98115,28.652917"
+       id="path39612" />
+  </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer9"
+     inkscape:label="Layer 8"
+     style="display:inline">
+    <g
+       id="g39701"
+       transform="matrix(1.2531725,0,0,1.2531725,270.48185,78.571721)"
+       style="display:inline">
+      <circle
+         style="fill:#62a0ea;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle39695"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text39699"><tspan
+           sodipodi:role="line"
+           id="tspan39697"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(50,83)</tspan></text>
+    </g>
+    <g
+       id="g39709"
+       transform="matrix(1.2531725,0,0,1.2531725,241.18103,78.421647)"
+       style="display:inline">
+      <circle
+         style="fill:#62a0ea;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle39703"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text39707"><tspan
+           sodipodi:role="line"
+           id="tspan39705"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(66,56)</tspan></text>
+    </g>
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.331568px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="m 295.804,110.29766 -3.44105,22.50135"
+       id="path39752" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.331568px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="m 301.04867,109.19787 19.3841,23.69448"
+       id="path39754" />
+    <circle
+       style="display:inline;fill:#62a0ea;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+       id="circle39836"
+       cx="40.755283"
+       cy="48.353146"
+       r="4.8799314"
+       transform="translate(96.244717,51.395992)" />
+    <circle
+       style="display:inline;fill:#62a0ea;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+       id="circle39839"
+       cx="40.755283"
+       cy="48.353146"
+       r="4.8799314"
+       transform="translate(64.244717,-2.6040082)" />
+    <path
+       style="display:inline;fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 105.08309,0.13576735 V 81.970847"
+       id="path39936"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="display:inline;fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 128.90321,45.400918 H 93.042157"
+       id="path39938"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="display:inline;fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 136.83314,81.926615 V 127.87251"
+       id="path39932"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="display:inline;fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 200.22572,99.905073 H 128.95629"
+       id="path39934"
+       sodipodi:nodetypes="cc" />
+  </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer10"
+     inkscape:label="Layer 9"
+     style="display:inline">
+    <g
+       id="g40546"
+       transform="matrix(1.2531725,0,0,1.2531725,305.93257,43.678412)"
+       style="display:inline">
+      <circle
+         style="fill:#26a269;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle40540"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text40544"><tspan
+           sodipodi:role="line"
+           id="tspan40542"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(60,14)</tspan></text>
+    </g>
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.331568px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 293.35904,67.360956 353.438,99.006151"
+       id="path40585"
+       sodipodi:nodetypes="cc" />
+    <circle
+       style="display:inline;fill:#26a269;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+       id="circle40724"
+       cx="40.755283"
+       cy="48.353146"
+       r="4.8799314"
+       transform="translate(84.244717,135.39599)" />
+    <path
+       style="display:inline;fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="m 124.79357,128.25689 v 71.94167"
+       id="path40781"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="display:inline;fill:none;stroke:#000000;stroke-width:0.264984px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 200.22572,183.51349 H 93.359051"
+       id="path40783"
+       sodipodi:nodetypes="cc" />
+  </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer11"
+     inkscape:label="Layer 10"
+     style="display:inline">
+    <circle
+       style="display:inline;fill:#8ff0a4;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+       id="circle41283"
+       cx="40.755283"
+       cy="48.353146"
+       r="4.8799314"
+       transform="translate(144.24472,109.39599)" />
+    <path
+       style="display:inline;fill:none;stroke:#000000;stroke-width:0.331568px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="m 357.83301,110.44337 3.37407,22.78032"
+       id="path41183" />
+    <g
+       id="g41068"
+       transform="matrix(1.2531725,0,0,1.2531725,310.50886,78.760675)"
+       style="display:inline">
+      <circle
+         style="fill:#8ff0a4;stroke:#241f31;stroke-width:0.240137;stroke-linejoin:round"
+         id="circle41062"
+         cx="40.755283"
+         cy="48.353146"
+         r="4.8799314" />
+      <text
+         xml:space="preserve"
+         style="font-size:5.64444px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;stroke-width:0.264583"
+         x="43.64225"
+         y="40.886948"
+         id="text41066"><tspan
+           sodipodi:role="line"
+           id="tspan41064"
+           style="stroke-width:0.264583"
+           x="43.64225"
+           y="40.886948">(90,27)</tspan></text>
+    </g>
+  </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer12"
+     inkscape:label="Layer 11"
+     style="display:inline">
+    <rect
+       style="fill:#8ff0a4;fill-opacity:0;stroke:#a51d2d;stroke-width:2;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none"
+       id="rect41468"
+       width="64.266823"
+       height="79.221146"
+       x="56.599369"
+       y="26.746742" />
+    <path
+       style="display:inline;fill:none;stroke:#a51d2d;stroke-width:2;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+       d="m 265.97557,84.535369 16.5554,29.939161 h 17.67882 l 8.31086,35.93433 h -65.8666 v -48.24123 z"
+       id="path42829" />
+  </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer13"
+     inkscape:label="Layer 12"
+     style="display:inline">
+    <rect
+       style="fill:#1a5fb4;fill-opacity:1;stroke:#a51d2d;stroke-width:0;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none"
+       id="rect41595"
+       width="37.007866"
+       height="47.490517"
+       x="0.1324995"
+       y="0.1324995" />
+    <rect
+       style="fill:#1a5fb4;fill-opacity:1;stroke:#a51d2d;stroke-width:0;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none"
+       id="rect41595-3"
+       width="199.90675"
+       height="72.181564"
+       x="0.22571807"
+       y="127.95094" />
+    <rect
+       style="fill:#1a5fb4;fill-opacity:1;stroke:#a51d2d;stroke-width:0;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none"
+       id="rect41595-3-6"
+       width="71.236862"
+       height="127.81518"
+       x="128.89561"
+       y="0.13576736" />
+    <path
+       style="fill:#1a5fb4;stroke:#1a5fb4;stroke-width:2;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+       d="m 328.07298,72.418286 -27.86319,42.056244 c 0,0 8.31086,35.93433 8.31086,35.93433 h 72.51747 L 369.27784,88.559271 Z"
+       id="path43015" />
+    <path
+       style="fill:#1a5fb4;stroke:#1a5fb4;stroke-width:2;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+       d="m 242.65405,102.16763 -21.47589,20.86608 H 208.24412 V 91.160768 l 16.58946,-11.845573 z"
+       id="path43085" />
+  </g>
+</svg>
diff --git a/src/teaching/cse-250/exams/2021fa_final.pdf b/src/teaching/cse-250/exams/2021fa_final.pdf
new file mode 100644
index 00000000..5b55d182
Binary files /dev/null and b/src/teaching/cse-250/exams/2021fa_final.pdf differ