| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] period [prep] | 176 |
|
| 2 | [adv prt] over a period [prep] | 25 |
|
| 3 | [adv prt] a [adj] period [prep] | 23 |
|
| 4 | [adv prt] over a [adj] period | 14 |
|
