| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [det] hours [art] | 20 |
|
| 2 | [prep] a few hours [art] | 20 |
|
| 3 | [prep] a few hours [art] | 20 |
|
| 4 | [prep] a [adj] hours a | 10 |
|
| 5 | for a [adj] hours [art] | 10 |
|
| 6 | [prep] a [adj] hours the | 8 |
|
