| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] them at a [noun sg] | 19 |
|
| 2 | [prep] them at a [noun] | 17 |
|
| 3 | [prep] them at a time | 8 |
|
| 4 | [prep] them at a time | 8 |
|
| 5 | of them at a [noun] | 7 |
|
