| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | in a [noun] | 61368 |
|
| 2 | [prep] a period | 2137 |
|
| 3 | in [art] period | 868 |
|
| 4 | in [art] period | 868 |
|
| 5 | in a period | 180 |
|
