| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] over a [adj] period | 43 |
|
| 2 | [adv] [prep] a long period | 36 |
|
| 3 | [adv] [prep] a long period | 36 |
|
| 4 | [adv] over a long [noun] | 26 |
|
| 5 | [adv] over a long period | 22 |
|
| 6 | [adv] over [art] long period | 22 |
|
| 7 | [adv] over [art] long period | 22 |
|
| 8 | [adv] over a long period | 22 |
|
