| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] hours a | 28 |
|
| 2 | a [det] hours a | 26 |
|
| 3 | a few hours a | 19 |
|
| 4 | a few hours a | 19 |
|
| 5 | a half hours a | 7 |
|
| 6 | a half hours a | 7 |
|
