| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] period | 519 |
|
| 2 | [pron] over a [adj] | 18 |
|
| 3 | [pron] over a period | 9 |
|
| 4 | [pron] a [adj] period | 8 |
|
