| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] over [art] period of | 88 |
|
| 2 | over [art] long period of | 85 |
|
| 3 | [verb] over [art] long period | 46 |
|
| 4 | [verb] [art] long period of | 22 |
|
