| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [prep] [art] period of | 198 |
|
| 2 | [prep] [art] long period of | 174 |
|
| 3 | [adv] [prep] [art] long period | 37 |
|
| 4 | [adv] [art] long period of | 13 |
|
| 5 | [adv] [prep] long period of | 12 |
|
