| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] [prep] a period of | 51 |
|
| 2 | [conj] [prep] a period of | 51 |
|
| 3 | [conj] over a [noun] of | 39 |
|
| 4 | [conj] over [art] period of | 26 |
|
| 5 | [conj] over a period of | 25 |
|
| 6 | [conj] over a period [prep] | 25 |
|
| 7 | [conj] over a period of | 25 |
|
| 8 | [conj] over a period [prep] | 25 |
|
