| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] period [prep] | 183 |
|
| 2 | [adv] over a period [prep] | 60 |
|
| 3 | [adv] a [adj] period [prep] | 58 |
|
| 4 | [adv] over a [adj] period | 44 |
|
