| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [art] [adj] period during [pron] | 8 |
|
| 2 | [prep] [art] [adj] period during which | 8 |
|
| 3 | [prep] [art] [adj] period during [Wh det] | 8 |
|
| 4 | [prep] [art] [adj] period during which | 8 |
|
