| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] a [adj] period [prep] | 159 |
|
| 2 | [verb] over a period [prep] | 60 |
|
| 3 | [verb] over a [adj] period | 58 |
|
| 4 | over a [adj] period [prep] | 19 |
|
