| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | only a [det] [noun] | 1285 |
|
| 2 | [adv] a [det] hour | 142 |
|
| 3 | only a [adj] hour | 73 |
|
| 4 | only [art] [det] hour | 72 |
|
