solutions C — fill 1-tile gap
| C-1: | 6 ~ | x ~ | 7 (mod = | 8) | no solutions |
| C-2: | 4 ~ | 6 ~ | 1 (mod = | 7) | M7-S2-A0 |
| C-3: | 12 ~ | 11 ~ | 10 (mod = | 15) | M15-S1-A0 |
| C-4: | 12 ~ | 3 ~ | 9 (mod = | 15) | M15-S6-A0 |
| C-5: | 6 ~ | 11 ~ | 2 (mod = | 14) | M14-S5-A0 |
| 6 ~ | 4 ~ | 2 (mod = | 14) | M14-S2-A0 | |
| C-6: | 2 ~ | 10 ~ | 7 (mod = | 11) | M11-S3-A0 |
| C-7: | 2 ~ | x ~ | 7 (mod = | 10) | no solutions |
| C-8: | 2 ~ | 5 ~ | 8 (mod = | 10) | M10-S3-A0 |
| 2 ~ | 0 ~ | 8 (mod = | 10) | M10-S2-A0 |