| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] over a period of | 25 |
|
| 2 | and [prep] a period of | 23 |
|
| 3 | and over a [noun] of | 21 |
|
| 4 | [coord] over a period of | 18 |
|
| 5 | and over a period of | 12 |
|
| 6 | and over a period [prep] | 12 |
|
| 7 | and over [art] period of | 12 |
|
| 8 | and over a period [prep] | 12 |
|
| 9 | and over a period of | 12 |
|
