| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [det] hours of | 48 |
|
| 2 | a few hours of | 35 |
|
| 3 | a few hours of | 35 |
|
| 4 | a half hours of | 13 |
|
| 5 | a half hours of | 13 |
|
