| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [noun] [prep] | 512 |
|
| 2 | [adv] a period [prep] | 117 |
|
| 3 | over [art] period [prep] | 64 |
|
| 4 | over [art] period [prep] | 64 |
|
| 5 | over a period [prep] | 62 |
|
