| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] over [art] [adj] period of | 16 |
|
| 2 | [adv] [prep] [art] long period of | 15 |
|
| 3 | [adv] over [art] long period [prep] | 9 |
|
| 4 | [adv] over [art] long [noun] of | 8 |
|
