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digraph Lattice {
compound = true;
// Define nodes
splines=false;
node [shape=oval, style=filled];
nodesep=0.2;
ranksep=0.4;
TOP [label="~scalar\n+int+tmp+0", fillcolor=black, fontcolor=white, group=center];
// ------------------------
PTRHQ [label="~tmp\n+tmp+0", fillcolor=green, fontcolor=white, group=left];
TOP -> PTRHQ
VALH_ [label="~nscalar\n+int+tmp", fillcolor=white, group=center];
TOP -> VALH_
INTHQ [label="~int\n+int+0", fillcolor=lightblue, group=right];
TOP -> INTHQ
LEFTHI [label="junk", style=invis, group=junkleft]
PTRHQ -> LEFTHI-> VALH_ -> INTHQ [style=invis];
{ rank=same; PTRHQ; LEFTHI; VALH_; INTHQ }
// ------------------------
PTRH_ [label="~ntmp\n+tmp", fillcolor=green, fontcolor=white, group=left];
VALH_ -> PTRH_
PTRHQ -> PTRH_
INTH_ [label="~nint\n+int", fillcolor=lightblue, group=right];
VALH_ -> INTH_
INTHQ -> INTH_
{ rank=same; PTRH_; INTH_ }
// ------------------------
NILX_ [label="~nil\n[int,tmp]+0", fillcolor=aqua, group=junkleft];
INTHQ -> NILX_
PTRHQ -> NILX_
NIL__ [label="nil\n[+int+tmp],0", fillcolor=pink];
VALH_ -> NIL__;
NILX_ -> NIL__ [style=invis];
{ rank=same; NIL__; NILX_ }
// ------------------------
PTRL_ [label="ntmp\ntmp", fillcolor=green, fontcolor=white, group=left];
PTRH_ -> PTRL_
INTL_ [label="nint\nint", fillcolor=lightblue, group=right];
INTH_ -> INTL_
{ rank=same; PTRL_; INTL_ }
// ------------------------
PTRL0 [label="tmp\ntmp,0", fillcolor=green, fontcolor=white, group=left];
PTRL_ -> PTRL0
NIL__ -> PTRL0
VALL_ [label="nscalar\nint,tmp", fillcolor=white, group=center];
PTRL_ -> VALL_
INTL_ -> VALL_
NILX_ -> VALL_
INTL0 [label="int\nint,0", fillcolor=lightblue, group=right];
INTL_ -> INTL0
NIL__ -> INTL0
PTRL0 -> VALL_ -> INTL0 [style=invis];
{ rank=same; PTRL0; VALL_; INTL0 }
// ------------------------
BOT [label="scalar\nint,tmp,0", fillcolor=black, fontcolor=white, group=center];
PTRL0 -> BOT
INTL0 -> BOT
VALL_ -> BOT
// ------------------------
// Verticle alignment
TOP -> VALH_ -> VALL_ -> BOT [style=invis];
PTRHQ -> PTRH_ -> PTRL_ -> PTRL0 [style=invis];
INTHQ -> INTH_ -> INTL_ -> INTL0 [style=invis];
LEFTHI -> NILX_ [style=invis]
}
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