| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [pron] [noun sg] at a | 124 |
|
| 2 | [prep] [noun sg] at a time | 75 |
|
| 3 | [pron] [noun sg] at a time | 30 |
|
| 4 | [prep] [pron] at a time | 30 |
|
