| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | in [noun] over a period of | 11 |
|
| 2 | in [noun] over a period [prep] | 11 |
|
| 3 | in [noun] over a period of | 11 |
|
| 4 | in [noun sg] over a period [prep] | 9 |
|
