| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] over a period of | 59 |
|
| 2 | [vb base] over a [noun] of | 26 |
|
| 3 | [vb base] over a [noun sg] of | 26 |
|
| 4 | [vb base] over [art] period of | 8 |
|
| 5 | [vb base] over [art] period of | 8 |
|
| 6 | [vb base] over a period of | 6 |
|
| 7 | [vb base] [adv] a period of | 6 |
|
| 8 | [vb base] over a period of | 6 |
|
| 9 | [vb base] over a period of | 6 |
|
| 10 | [vb base] over a period [prep] | 6 |
|
| 11 | [vb base] over a period [prep] | 6 |
|
| 12 | [vb base] [adv prt] a period of | 6 |
|
| 13 | [vb base] over a period of | 6 |
|
