| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] over a [adj] period of | 71 |
|
| 2 | [noun sg] over a [adj] period of | 55 |
|
| 3 | [noun] over a long period of | 45 |
|
| 4 | [noun] over a long period of | 40 |
|
| 5 | [noun pl] over a [adj] period of | 17 |
|
| 6 | [noun] over a prolonged period of | 7 |
|
| 7 | [noun] over a prolonged period of | 7 |
|
| 8 | [noun] over a [adj -er] period of | 6 |
|
| 9 | [noun] over a longer period of | 5 |
|
