| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a limited period of time | 15 |
|
| 2 | [prep] a limited period [prep] time | 15 |
|
| 3 | [prep] a limited period [prep] time | 15 |
|
| 4 | [prep] a limited period of time | 15 |
|
| 5 | for a limited period [prep] time | 13 |
|
