| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at a time [Wh adv] [adj] | 137 |
|
| 2 | at a time [Wh adv] [noun pl] | 96 |
|
| 3 | a time [Wh adv] [adj] [noun pl] | 78 |
|
