See: \ref{the_example}
graph graphname {
a [texlbl="$\alpha$"];
b [texlbl="$\beta$"];
b1 [texlbl="$\beta_1$"];
b2 [texlbl="$\beta_2$"];
a -- b
b -- b1
b -- b2
}
graph graphname{
a [texlbl="$e^{\frac{(i \pm j \pm k)}{\sqrt 3}\pi} + 1$"];
b [texlbl="$e^{i \pi} +1$"];
a -- b;
}
graph graphname{
a -- b
}
graph tall{
a -- b -- c -- d -- e -- f -- g
}