| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] a [adj] period [prep] | 180 |
|
| 2 | a very [adj] period [prep] | 50 |
|
| 3 | [verb] a very [adj] period | 9 |
|
| 4 | [verb] a very [adj] [prep] | 6 |
|
