| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over such a [adj] period | 8 |
|
| 2 | over such a [adj] period | 8 |
|
| 3 | over [det] a [adj] period | 8 |
|
| 4 | over [adj] a long period | 5 |
|
