| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [prep] a limited period | 17 |
|
| 2 | [verb] [prep] a limited period | 17 |
|
| 3 | [verb] for a limited period | 14 |
|
| 4 | [verb] for a limited period | 14 |
|
| 5 | [vb pp] [prep] a limited period | 12 |
|
