| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over [art] long period of | 85 |
|
| 2 | [vb pp] over [art] period of | 76 |
|
| 3 | [vb pp] over [art] long period | 44 |
|
| 4 | [vb pp] [art] long period of | 6 |
|
