| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [det] hours [prep] | 205 |
|
| 2 | for a [det] hours | 157 |
|
| 3 | for [det] hours [prep] | 39 |
|
| 4 | for a [det] [prep] | 10 |
|
