| graph A { | |
| node[shape="circle"] | |
| B [ style="filled", fillcolor="red" ]; | |
| G [ style="filled", fillcolor="red" ]; | |
| A [ style="filled", fillcolor="red" ]; | |
| A -- F[label="1"] | |
| A -- B[label="1"] | |
| A -- G[label="3"] | |
| B -- C[label="0"] | |
| B -- D[label="0"] | |
| B -- E[label="1"] | |
| C -- D[label="0"] | |
| E -- F[label="1"] | |
| G -- I[label="2"] | |
| G -- H[label="2"] | |
| H -- I[label="2"] | |
| } |