| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adv] [adj] period | 219 |
|
| 2 | a [adj] period in | 109 |
|
| 3 | a [adv] [adj] in | 77 |
|
| 4 | [adv] [adj] period in | 42 |
|
