| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [adv] a [adj] period | 11 |
|
| 2 | [be] [adv] a [adj] period | 11 |
|
| 3 | [be] [adv] a [adj] period | 9 |
|
| 4 | [is] [adv] a [adj] period | 7 |
|
| 5 | is [adv] a [adj] period | 6 |
|
