Item | |||
| 1 | 2 | 3 |
1 | (Y1, X1) | (Y1, X4) | (Y1, X7) |
2 | (Y2, X2) | (Y2, X3) | (Y2, X6) |
3 | (Y3, X1) | (Y3, X5) | (Y3, X7) |
4 | (Y4, X1) | (Y4, X3) | (Y4, X6) |
5 | (Y5, X2) | (Y5, X5) | (Y5, X6) |
6 | (Y6, X2) | (Y6, X4) | (Y6, X7) |