| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | for a [adj] period [prep] | 257 |
|
| 2 | only for a [adj] period | 17 |
|
| 3 | only a [adj] period [prep] | 14 |
|
| 4 | only for [adj] period [prep] | 7 |
|
