| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a few hours of [verb] | 5 |
|
| 2 | within a few hours of [verb] | 5 |
|
| 3 | [prep] a few hours of [verb] | 5 |
|
| 4 | within a few hours of [verb] | 5 |
|
