| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | for a [adj] period | 691 |
|
| 2 | [pron] for a [adj] | 666 |
|
| 3 | [pron] for a period | 13 |
|
| 4 | [pron] a [adj] period | 8 |
|
