| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] [prep] a [adj] period [prep] | 140 |
|
| 2 | [vb pp] during a [adj] [noun] [prep] | 45 |
|
| 3 | [vb pp] during [art] [adj] period [prep] | 16 |
|
| 4 | [verb] during a [adj] period [prep] | 6 |
|
