| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] [prep] [art] period of | 274 |
|
| 2 | [prep] [art] long period of | 168 |
|
| 3 | [vb pp] [prep] [art] long period | 70 |
|
| 4 | [vb pp] [art] long period of | 6 |
|
