digraph ex1p2a4 { rankdir="LR"; node [texmode="math",shape="circle",style="state"]; qi [style="state,initial",label="0",texlbl="$\phantom{0}$"]; q0 [style="state",label="0"]; q7 [style="state",label="7"]; qf [style="state,final",label="7",texlbl="$\phantom{7}$"]; edge [texmode="math",lblstyle="auto"]; qi -> q0 [label="e",texlbl="$\varepsilon$"]; q0 -> q0 [label="a|b",topath="loop below"]; q0 -> q7 [label="aa|bb"]; q7 -> q7 [label="a|b",topath="loop below"]; q7 -> qf [label="e",texlbl="$\varepsilon$"]; }