| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] over a [adj] period of | 13 |
|
| 2 | over a [adj] period of time | 16 |
|
| 3 | over a [adj] period of time | 16 |
|
| 4 | over a [adj] period of [noun sg] | 16 |
|
| 5 | over a [adj] period of [noun] | 16 |
|
