diff --git a/src/teaching/cse-562/2019sp/slide/2019-02-15-Physical.html b/src/teaching/cse-562/2019sp/slide/2019-02-15-Physical.html
index 3a7ba0c3..0ba31eae 100644
--- a/src/teaching/cse-562/2019sp/slide/2019-02-15-Physical.html
+++ b/src/teaching/cse-562/2019sp/slide/2019-02-15-Physical.html
@@ -15,7 +15,6 @@ textbook: "Ch. 13.1-13.7, 15.7, 16.7"
'09/05/2015' | 204026 | 218365 | 'POINT (-73.93660770459083 40.717580740099116)' | 3 | 0 | 'OnCurb' | 'Alive' | 'Good' | 'Gleditsia triacanthos var. inermis' | 'honeylocust' | '1or2' | 'None' | 'Damage' | 'Volunteer' | 'None' | 'No' | 'No' | 'No' | 'No' | 'No' | 'No' | 'No' | 'No' | 'No' | '390 MORGAN AVENUE' | '11211' | 'Brooklyn' | 301 | 3 | 'Brooklyn' | 34 | 50 | 18 | 'BK90' | 'East Williamsburg' | 3044900 | 'New York' | 40.71758074 | -73.9366077 | 1001822.83131 | 200716.891267 |
'09/05/2015' | 204337 | 217969 | 'POINT (-73.93445615919741 40.713537494833226)' | 10 | 0 | 'OnCurb' | 'Alive' | 'Good' | 'Gleditsia triacanthos var. inermis' | 'honeylocust' | 'None' | 'None' | 'Damage' | 'Volunteer' | 'Stones' | 'Yes' | 'No' | 'No' | 'No' | 'No' | 'No' | 'No' | 'No' | 'No' | '1027 GRAND STREET' | '11211' | 'Brooklyn' | 301 | 3 | 'Brooklyn' | 34 | 53 | 18 | 'BK90' | 'East Williamsburg' | 3044900 | 'New York' | 40.71353749 | -73.93445616 | 1002420.35833 | 199244.253136 |
'08/30/2015' | 189565 | 223043 | 'POINT (-73.97597938483258 40.66677775537875)' | 21 | 0 | 'OnCurb' | 'Alive' | 'Good' | 'Tilia americana' | 'American linden' | 'None' | 'None' | 'Damage' | 'Volunteer' | 'Stones' | 'Yes' | 'No' | 'No' | 'No' | 'No' | 'No' | 'No' | 'No' | 'No' | '603 6 STREET' | '11215' | 'Brooklyn' | 306 | 3 | 'Brooklyn' | 39 | 44 | 21 | 'BK37' | 'Park Slope-Gowanus' | 3016500 | 'New York' | 40.66677776 | -73.97597938 | 990913.775046 | 182202.425999 |
- ... and 683783 more |
↓
@@ -109,7 +108,15 @@ textbook: "Ch. 13.1-13.7, 15.7, 16.7"
Problem 2.b: How should you store records in a page?
- Key question: Where in the page is record #43?
+
+
+
+ Goal 1: Where is record $X$?
+ Goal 2: Support updates/deletions
+
+
+