digraph G {
A -> B [label="1"];
A -> C [label="1"];
A -> D [label="1"];
A -> G [label="1"];
B -> C [label="2"];
B -> E [label="2"];
C -> G [label="3"];
C -> F [label="3"];
C -> D [label="3"];
D -> F [label="3"];
D -> E [label="3"];
D -> H [label="3"];
D -> G [label="3"];
E -> F [label="3"];
F -> G [label="3"];
F -> H [label="3"];
H -> A [label="3"];
D -> B [label="3"];
E -> A [label="3"];
H -> G [label="3"];
K -> A [label="3"];
K -> I [label="3"];
L -> A [label="3"];
I -> K [label="3"];
I -> J [label="3"];
K -> L [label="3"];
J -> L [label="3"];
J -> M [label="3"];
L -> M [label="3"];
}