| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [art] period [prep] | 3161 |
|
| 2 | [prep] [art] long period | 324 |
|
| 3 | [art] long period [prep] | 253 |
|
| 4 | [prep] long period [prep] | 159 |
|
