| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [num] [noun] over a [adj] period | 12 |
|
| 2 | [num] [noun] over a [adj] period | 12 |
|
| 3 | [num] [noun] over a period [prep] | 15 |
|
| 4 | [num] [noun] over a period of | 15 |
|
| 5 | [num] [noun] over a period of | 15 |
|
| 6 | [num] [noun] over a period [prep] | 15 |
|
