solutions D — fill 2-tile gap
| D-1: | 6 ~ | 1 ~ | 4 ~ | 7 (mod = | 8) | M8-S3-A0 |
| D-2: | 4 ~ | 3 ~ | 2 ~ | 1 (mod = | 7) | M7-S1-A0 |
| D-3: | 5 ~ | 7 ~ | 0 ~ | 2 (mod = | 9) | M9-S2-A0 |
| 5 ~ | 1 ~ | 6 ~ | 2 (mod = | 9) | M9-S4-A0 | |
| 5 ~ | 4 ~ | 3 ~ | 2 (mod = | 9) | M9-S1-A0 | |
| D-4: | 6 ~ | 8 ~ | 0 ~ | 2 (mod = | 10) | M10-S2-A0 |
| D-5: | 6 ~ | 9 ~ | 2 ~ | 5 (mod = | 10) | M10-S3-A0 |
| D-6: | 6 ~ | 9 ~ | 1 ~ | 4 (mod = | 11) | M11-S3-A0 |
| D-7: | 6 ~ | x ~ | y ~ | 11 (mod = | 12) | no solutions |
| D-8: | 5 ~ | 5 ~ | 5 ~ | 5 (mod = | 6) | M6-S0-A5 |
| 5 ~ | 1 ~ | 3 ~ | 5 (mod = | 6) | M6-S2-A1 | |
| 5 ~ | 3 ~ | 1 ~ | 5 (mod = | 6) | M6-S2-A1 |