| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [art] long period of | 252 |
|
| 2 | [vb past] [art] period of | 74 |
|
| 3 | [vb past] [art] long period | 11 |
|
| 4 | [vb past] long period of | 7 |
|
