| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [noun] at a time | 203 |
|
| 2 | [prep] [noun] [verb] at a | 196 |
|
| 3 | [noun] [verb] at a time | 98 |
|
| 4 | [prep] [verb] at a time | 5 |
|
