| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | in the 15th | 42 |
|
| 2 | on the 15th | 24 |
|
| 3 | of the 15th | 22 |
|
| 4 | to the 15th | 18 |
|
| 5 | at the 15th | 16 |
|
| 6 | from the 15th | 10 |
|
| 7 | by the 15th | 6 |
|
| 8 | during the 15th | 5 |
|
