| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [prep] [indef pn] at a [noun sg] | 7 |
|
| 2 | [verb] [prep] [indef pn] at a [noun] | 7 |
|
| 3 | [verb] [prep] [indef pn] at a time | 6 |
|
| 4 | [verb] [prep] [indef pn] at a time | 6 |
|
