4 5 2
0 1 0.5 E
0 -1 0.5 F
0 -1 -0.5 G
0 1 -0.5 H
1 2 EF
2 3 FG
3 4 GH
4 1 HE
1 3 EG
1 2 5 EFG
3 4 5 GHE