| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [art] [noun] at a | 928 |
|
| 2 | [prep] [noun] at a time | 203 |
|
| 3 | [art] [noun] at a time | 191 |
|
| 4 | [prep] [art] [noun] a time | 5 |
|
| 5 | [prep] [art] [noun] at time | 5 |
|
