| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [num] [noun] | 5295 |
|
| 2 | [prep] a [num] [noun pl] | 1272 |
|
| 3 | [prep] a [adj] days | 826 |
|
| 4 | [prep] [art] [num] days | 233 |
|
| 5 | [prep] a [num] day | 127 |
|
