digraph "sumprod" {
rankdir="LR";
remincross=true;
v0 [ label="a" ];
v1 [ label="b" ];
v2 [ label="$1_Y" ];
c4 [ shape=record, label="{{<p1> A|<p2> B}|$1\n$add|{<p3> Y}}" ];
v3 [ label="$1_Y" ];
v4 [ label="c" ];
v5 [ label="sum" ];
c5 [ shape=record, label="{{<p1> A|<p2> B}|$2\n$add|{<p3> Y}}" ];
v0:e -> c4:p1:w [color="black", style="setlinewidth(3)", label=""];
v1:e -> c4:p2:w [color="black", style="setlinewidth(3)", label=""];
c4:p3:e -> v2:w [color="black", style="setlinewidth(3)", label=""];
v3:e -> c5:p1:w [color="black", style="setlinewidth(3)", label=""];
v4:e -> c5:p2:w [color="black", style="setlinewidth(3)", label=""];
c5:p3:e -> v5:w [color="black", style="setlinewidth(3)", label=""];
};