| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] period [prep] | 871 |
|
| 2 | during a [adj] [noun] [prep] | 324 |
|
| 3 | during a [adj] [noun sg] [prep] | 319 |
|
| 4 | during [art] [adj] period [prep] | 136 |
|
| 5 | during a [adj] period [prep] | 30 |
|
