| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | there be a [adj] period | 27 |
|
| 2 | [ex0] be a [adj] period | 24 |
|
| 3 | [ex0] be a [adj] period | 23 |
|
| 4 | [ex0] was a [adj] period | 15 |
|
| 5 | [ex0] is a [adj] period | 8 |
|
