| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] hours [prep] | 58 |
|
| 2 | [prep] [adj] hours [prep] [adv] | 25 |
|
| 3 | [prep] a [adj] hours [adv] | 24 |
|
| 4 | [prep] a [adj] [prep] [adv] | 11 |
|
| 5 | a [adj] hours [prep] [adv] | 6 |
|
