| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] period | 545 |
|
| 2 | over [det] a [adj] | 40 |
|
| 3 | [det] a [adj] period | 34 |
|
| 4 | over [det] [adj] period | 16 |
|
| 5 | over [det] a period | 5 |
|
