| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [prep] [art] period of | 193 |
|
| 2 | [prep] [art] long period of | 168 |
|
| 3 | [adv] [prep] [art] long period | 37 |
|
| 4 | [adv] [art] long period of | 13 |
|
