| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] long period of | 114 |
|
| 2 | [adv] long period of | 44 |
|
| 3 | [adv] [prep] long period | 28 |
|
| 4 | [adv] [prep] period of | 27 |
|
