| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] period [prep] time | 297 |
|
| 2 | [prep] a [adj] period [prep] time | 297 |
|
| 3 | in a [adj] [noun] [prep] time | 69 |
|
| 4 | in a [adj] period [prep] [noun] | 21 |
|
| 5 | in a [adj] period [prep] [noun sg] | 21 |
|
| 6 | in [art] [adj] period [prep] time | 19 |
|
| 7 | in a [adj] period [prep] time | 15 |
|
| 8 | in a [adj] period [prep] time | 15 |
|
| 9 | in a [adj] period [prep] time | 15 |
|
