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diff --git a/docs/chapter13/graph7.gv b/docs/chapter13/graph7.gv
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+digraph chapter13 {
+ rankdir=BT;
+ concentrate="true";
+ compound="true";
+ subgraph cluster_Nodes {
+ Start2 [ shape=plaintext label=<
+ <TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0" CELLPADDING="4">
+ <TR><TD BGCOLOR="yellow">Start</TD></TR>
+ <TR><TD>
+ <TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
+ <TR><TD PORT="p0" BGCOLOR="yellow">$ctrl</TD></TR>
+ </TABLE>
+ </TD></TR>
+ </TABLE>>
+ ];
+ Con_4 [ label="#0" ];
+ Loop8 [ shape=box style=filled fillcolor=yellow label="Loop" ];
+ { rank=same; Loop8;}
+ }
+ edge [ fontname=Helvetica, fontsize=8 ];
+ Loop8 -> Start2:p0[taillabel=1 color=red];
+ Loop8 -> Loop8[taillabel=2 color=red constraint=false];
+}