| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at a [noun] | 15341 |
|
| 2 | at a [noun sg] | 14548 |
|
| 3 | at [art] time | 11424 |
|
| 4 | at [art] time | 11424 |
|
| 5 | [prep] a time | 4727 |
|
| 6 | [prep] a time | 4727 |
|
| 7 | at a time | 3145 |
|
| 8 | at a time | 3145 |
|
| 9 | at a time | 3145 |
|
