B, C, E, F, G, H, L, N, P, Q, R, S
12
A, B, C, E, F, G, H, I, L, N, O, P, Q, R, S
15
A, F, G, H, I, L, O, Q
8
A, B, C, F, G, H, L, N, Q
9
A, B, C, E, F, G, I, L, N, O, P, Q, S
13
A, I, O, R
4
R
1
A, R
2
C, F, I, P, R
5
B, C, E, H, I, N, O, P, R, S
10
B, G, I, L, O, P, Q, R
A, C, E, G, H, I, L, N, O, P, Q, S
B, C, E, H, L, N, P, S
F
E, F, Q
3
B, G, H, O
A, S
E, N, S