problems B — extend both ends
| B-1: x ~ | 6 ~ | 7 ~ y (mod = | 9) |
| B-2: x ~ | 6 ~ | 7 ~ y (mod = | 8) |
| B-3: x ~ | 0 ~ | 1 ~ y (mod = | 9) |
| B-4: x ~ | 0 ~ | 1 ~ y (mod = | 8) |
| B-5: x ~ | 4 ~ | 1 ~ y (mod = | 7) |
| B-6: x ~ | 12 ~ | 10 ~ y (mod = | 15) |
| B-7: x ~ | 9 ~ | 5 ~ y (mod = | 14) |
| B-8: x ~ | 3 ~ | 3 ~ y (mod = | 12) |
| B-9: x ~ | 4 ~ | 9 ~ y (mod = | 11) |
| B-10: x ~ | 7 ~ | 2 ~ y (mod = | 10) |