| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] period | 488 |
|
| 2 | [conj] a [adj] period | 73 |
|
| 3 | [conj] over a [adj] | 48 |
|
| 4 | [conj] over a period | 29 |
|
