Changed SQL in S.3 to subscripts.

mult_distinct_p.tex

@@ -70,7 +70,7 @@ The query $\qhard^k$ then becomes
 \mdfdefinestyle{underbrace}{topline=false, rightline=false, bottomline=false, leftline=false, backgroundcolor=black!15!white, innerbottommargin=0pt}
 \begin{mdframed}[style=underbrace]
 \begin{lstlisting}
-SELECT COUNT(*) FROM $\underbrace{Q^1\text{ JOIN }Q^1\text{ JOIN}\cdots\text{JOIN }Q^1}_{k\rm\ times}$
+SELECT COUNT(*) FROM $\underbrace{Q_1\text{ JOIN }Q_1\text{ JOIN}\cdots\text{JOIN }Q_1}_{k\rm\ times}$
 \end{lstlisting}          
 \end{mdframed}
 \noindent %Consider again the \abbrCTIDB instance $\pdb$ of~\Cref{fig:two-step} and, for our hard instance, let $\bound = 1$.  $\pdb$ generalizes to one compatible