| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] over a [adj] period | 262 |
|
| 2 | [num] [noun] over a [adj] | 30 |
|
| 3 | [num] [noun] over a period | 15 |
|
| 4 | [num] over a [adj] period | 9 |
|
