| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] long period [prep] | 175 |
|
| 2 | [adv] long period [prep] | 56 |
|
| 3 | [adv] [prep] long period | 39 |
|
| 4 | [adv] [prep] period [prep] | 31 |
|
