| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] over a [adj] | 82 |
|
| 2 | over a [adj] period | 72 |
|
| 3 | [to-vb] a [adj] period | 32 |
|
| 4 | [to-vb] over a period | 6 |
|
