| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [noun pl] at a time | 96 |
|
| 2 | [prep] [noun pl] [verb] at a | 65 |
|
| 3 | [noun pl] [verb] at a time | 25 |
|
| 4 | [prep] [verb] at a time | 5 |
|
