| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] during which [art] | 168 |
|
| 2 | period [prep] which [art] | 149 |
|
| 3 | period during which [art] | 50 |
|
| 4 | period during [pron] [art] | 50 |
|
