| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] over a period [prep] | 60 |
|
| 2 | extend over a [noun sg] [prep] | 8 |
|
| 3 | extend over a [noun] [prep] | 8 |
|
| 4 | extend [adv] a period [prep] | 5 |
|
| 5 | extend over a period [prep] | 5 |
|
| 6 | extend over a period [prep] | 5 |
|
| 7 | extend over [art] period [prep] | 5 |
|
| 8 | extend over [art] period [prep] | 5 |
|
