| source | target |
| 2 | 1 |
| 3 | 1 |
| 3 | 2 |
| 4 | 1 |
| 4 | 2 |
| 4 | 3 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 7 | 5 |
| 7 | 6 |
| 8 | 1 |
| 8 | 2 |
| 8 | 3 |
| 8 | 4 |
| 9 | 1 |
| 9 | 3 |
| 10 | 3 |
| 11 | 1 |
| 11 | 5 |
| 11 | 6 |
| 12 | 1 |
| 13 | 1 |
| 13 | 4 |
| 14 | 1 |
| 14 | 2 |
| 14 | 3 |
| 14 | 4 |
| 17 | 6 |
| 17 | 7 |
| 18 | 1 |
| 18 | 2 |
| 20 | 1 |
| 20 | 2 |
| 22 | 1 |
| 22 | 2 |
| 26 | 24 |
| 26 | 25 |
| 28 | 3 |
| 28 | 24 |
| 28 | 25 |
| 29 | 3 |
| 30 | 24 |
| 30 | 27 |
| 31 | 2 |
| 31 | 9 |
| 32 | 1 |
| 32 | 25 |
| 32 | 26 |
| 32 | 29 |
| 33 | 3 |
| 33 | 9 |
| 33 | 15 |
| 34 | 16 |
| 35 | 19 |
| 36 | 21 |
| 37 | 23 |
| 38 | 24 |
| 39 | 30 |
| 40 | 31 |
| 41 | 32 |