| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] over a [adj] period [prep] | 19 |
|
| 2 | [adv] over a [adj] period [prep] | 19 |
|
| 3 | [adv] over a [adj] period [prep] | 18 |
|
| 4 | [adv] over a [adj] period of | 13 |
|
| 5 | [adv] over a [adj] period of | 13 |
|
| 6 | [adv] over a [adj] period [prep] | 12 |
|
| 7 | [adv] over a long period [prep] | 9 |
|
| 8 | [adv] over a long period [prep] | 9 |
|
| 9 | [adv prt] over a [adj] period [prep] | 7 |
|
