| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] over [art] period of | 88 |
|
| 2 | over [art] long period of | 78 |
|
| 3 | [verb] over [art] long period | 35 |
|
| 4 | [verb] [art] long period of | 18 |
|
