| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] at a time | 1497 |
|
| 2 | [prep] [noun] at a | 1438 |
|
| 3 | [prep] [noun] a time | 46 |
|
| 4 | [prep] [noun] at time | 20 |
|
