| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [adv] over [art] period | 10 |
|
| 2 | [noun] [adv] over a period | 9 |
|
| 3 | [noun] [adv] over a period | 9 |
|
| 4 | [noun pl] [adv] over [art] period | 5 |
|
