digraph example7bm { rankdir="LR"; node [texmode="math",shape="circle",style="state"]; q01 [style="state,initial",label="0|1",texlbl="$0\equiv 1$"]; q23 [style="state",label="2|3",texlbl="$2\equiv 3$"]; q45 [style="state,final",label="4|5",texlbl="$4\equiv 5$"]; edge [texmode="math",lblstyle="auto"]; q01 -> q01 [label="b,c",topath="loop above"]; q23 -> q23 [label="a,c",topath="loop above"]; q45 -> q45 [label="a,b,c",topath="loop above"]; q01 -> q23 [label="a"]; q23 -> q45 [label="b"]; }