| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over [art] [adv] [adj] period | 34 |
|
| 2 | over [art] [adv] long period | 22 |
|
| 3 | [prep] [art] [adv] longer period | 22 |
|
| 4 | over [art] [adv] longer [noun] | 16 |
|
| 5 | over [art] [adv] [adj -er] period | 13 |
|
