| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] [noun sg] at a | 374 |
|
| 2 | [prep] [noun sg] at a time | 75 |
|
| 3 | [noun] [noun sg] at a time | 61 |
|
| 4 | [noun] [prep] [noun sg] at time | 8 |
|
