| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [art] period [prep] | 4704 |
|
| 2 | [verb] [art] period | 700 |
|
| 3 | [verb] [art] [prep] | 476 |
|
| 4 | [verb] period [prep] | 23 |
|
