| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [art] period [prep] | 3161 |
|
| 2 | [prep] such [art] period | 18 |
|
| 3 | such [art] period [prep] | 11 |
|
| 4 | [prep] such period [prep] | 6 |
|
