| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [det] [noun] [pron] | 514 |
|
| 2 | [prep] a [det] [noun pl] [pron] | 478 |
|
| 3 | [prep] [art] [det] hours [pron] | 18 |
|
| 4 | [prep] a [det] hour [pron] | 15 |
|
| 5 | [prep] a [adj] hours [pron] | 15 |
|
