| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] a [adj] period of | 135 |
|
| 2 | after a [adj] period of | 64 |
|
| 3 | [verb] after a [adj] period | 23 |
|
| 4 | [verb] after a period of | 17 |
|
