| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [art] period [verb] | 279 |
|
| 2 | [prep] [art] period and | 64 |
|
| 3 | [prep] [art] and [verb] | 40 |
|
| 4 | [art] period and [verb] | 17 |
|
