| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at [adj] time [prep] | 1422 |
|
| 2 | a [adj] time [prep] | 1310 |
|
| 3 | at a time [prep] | 476 |
|
| 4 | at a [adj] time | 433 |
|
| 5 | at a [adj] [prep] | 37 |
|
