| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over [art] long period of | 78 |
|
| 2 | [adv] over [art] period of | 68 |
|
| 3 | [adv] over [art] long period | 18 |
|
| 4 | [adv] [art] long period of | 12 |
|
