| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] period | 519 |
|
| 2 | [adv] over a [adj] | 160 |
|
| 3 | [adv] a [adj] period | 138 |
|
| 4 | [adv] over a period | 69 |
|
| 5 | [adv] over [adj] period | 18 |
|
