| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] and over a period | 5 |
|
| 2 | and [noun] over a period | 7 |
|
| 3 | and over a period [prep] | 12 |
|
| 4 | and over a period of | 12 |
|
| 5 | and over a period of | 12 |
|
| 6 | and over a period [prep] | 12 |
|
