For every three tables below, the first two should have borders between some cells, but not the third:
| X |
| X |
| X |
| X |
| X |
| X |
| X |
| X |
| X |
| X | X | X |
| X | X | X |
| X | X | X |
| X | X | X |
| X | X | X |
| X | X | X |
For every three tables below, the first two should have borders on some edges, but not the third:
| X |
| X |
| X |
| X |
| X |
| X |
| X |
| X |
| X |
| X |
| X |
| X |