A, B, C, E, F, G
6
A, B, F
3
A, C, E, F
4
B, C, E, G
F, G
2
0
A, C, E, F, G
5
A, B, C, F
A, F, G
A, B, C, E, F
A, B, C, E
A, B, C, E, G
B, G
B, E, F, G
C, E, G