| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] over a period of | 59 |
|
| 2 | extend over a [noun sg] of | 8 |
|
| 3 | extend over a [noun] of | 8 |
|
| 4 | extend over a period [prep] | 5 |
|
| 5 | extend over [art] period of | 5 |
|
| 6 | extend over [art] period of | 5 |
|
| 7 | extend over a period of | 5 |
|
| 8 | extend over a period of | 5 |
|
| 9 | extend [adv] a period of | 5 |
|
| 10 | extend over a period [prep] | 5 |
|
| 11 | extend over a period of | 5 |
|
