| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | during a [adj] period [prep] | 24 |
|
| 2 | during a [adj] period of | 13 |
|
| 3 | during a [adj] period in | 8 |
|
| 4 | during a long period [prep] | 5 |
|
