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