| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [prep] a limited period | 7 |
|
| 2 | [adv] [prep] a limited period | 7 |
|
| 3 | [adv] for a limited period | 6 |
|
| 4 | [adv] for a limited period | 6 |
|
