fix figure ref

book.tex

@@ -26,7 +26,7 @@
 
 \def\racketEd{0}
 \def\pythonEd{1}
-\def\edition{1}
+\def\edition{0}
 
 % material that is specific to the Racket edition of the book
 \newcommand{\racket}[1]{{\if\edition\racketEd{#1}\fi}}
@@ -10810,13 +10810,14 @@ block_4:
 \subsection{Remove Jumps}
 
 There is an opportunity for removing jumps that is apparent in the
-example of figure~\ref{fig:if-example-x86}. The \code{start} block
-ends with a jump to \racket{\code{block\_5}}\python{\code{block\_4}},
-and there are no other jumps to
-\racket{\code{block\_5}}\python{\code{block\_4}} in the rest of the program.
-In this situation we can avoid the runtime overhead of this jump by merging
-\racket{\code{block\_5}}\python{\code{block\_4}}
-into the preceding block, which in this case is the \code{start} block.
+example of figure~\ref{fig:explicate-control-challenge}. The
+\code{start} block ends with a jump to
+\racket{\code{block\_5}}\python{\code{block\_4}}, and there are no
+other jumps to \racket{\code{block\_5}}\python{\code{block\_4}} in
+the rest of the program.  In this situation we can avoid the runtime
+overhead of this jump by merging
+\racket{\code{block\_5}}\python{\code{block\_4}} into the preceding
+block, which in this case is the \code{start} block.
 Figure~\ref{fig:remove-jumps} shows the output of
 \code{allocate\_registers} on the left and the result of this
 optimization on the right.