| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] over a [adj] period | 289 |
|
| 2 | [vb pp] over a [adj] period | 83 |
|
| 3 | [noun] [vb pp] over a [adj] | 43 |
|
| 4 | [noun] [vb pp] over a period | 9 |
|
