| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] period | 545 |
|
| 2 | [verb] over a [adj] | 394 |
|
| 3 | [verb] a [adj] period | 270 |
|
| 4 | [verb] over a period | 83 |
|
| 5 | [verb] over [adj] period | 16 |
|
