| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at [num] [noun sg] a [noun sg] [prep] | 11 |
|
| 2 | at one [noun sg] a [noun] [prep] | 10 |
|
| 3 | at [num] [noun sg] a [noun] of | 10 |
|
| 4 | at [num] time a [noun] [prep] | 7 |
|
