| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a few hours each | 6 |
|
| 2 | [prep] a few hours each | 6 |
|
| 3 | [prep] a few hours each | 6 |
|
| 4 | for a few hours each | 6 |
|
| 5 | for a few hours each | 6 |
|
