| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] over a [adj] period | 84 |
|
| 2 | [adv] over a [adj] period | 44 |
|
| 3 | [vb pp] [adv] over a [adj] | 39 |
|
| 4 | [vb pp] [adv] over a period | 19 |
|
| 5 | [vb pp] [adv] a [adj] period | 8 |
|
