| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a limited period of | 15 |
|
| 2 | [prep] a limited period of | 15 |
|
| 3 | for a limited period of | 13 |
|
| 4 | for a limited period of | 13 |
|
| 5 | a limited period of [noun sg] | 19 |
|
| 6 | a limited period of [noun] | 19 |
|
| 7 | a limited period of time | 18 |
|
| 8 | a limited period of time | 18 |
|
