| A | B |
| 1 | * |
| 2 | * * |
| 3 | * * * |
| 4 | * * * * |
| 5 | * * * * * |
| 6 | * * * * * * |
| 7 | * * * * * * * |
| 8 | * * * * * * * * |
| 9 | * * * * * * * * * |
| 10 | * * * * * * * * * * |
| 11 | * * * * * * * * * * * |
| 12 | * * * * * * * * * * * * |
| 13 | * * * * * * * * * * * * * |
| 14 | * * * * * * * * * * * * * * |
| 15 | * * * * * * * * * * * * * * * |
| 16 | * * * * * * * * * * * * * * * * |
| 17 | * * * * * * * * * * * * * * * * * |
| 18 | * * * * * * * * * * * * * * * * * * |
| 19 | * * * * * * * * * * * * * * * * * * * |
| 20 | * * * * * * * * * * * * * * * * * * * * |