| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [noun] | 1449 |
|
| 2 | over a [noun sg] | 1396 |
|
| 3 | [adv] a period | 152 |
|
| 4 | over [art] period | 69 |
|
| 5 | over [art] period | 69 |
|
| 6 | over a period | 67 |
|
| 7 | over a period | 67 |
|
