| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a period | 2137 |
|
| 2 | [prep] a period | 2137 |
|
| 3 | during a [noun] | 1718 |
|
| 4 | during [art] period | 807 |
|
| 5 | during [art] period | 807 |
|
| 6 | during a period | 110 |
|
| 7 | during a period | 110 |
|
