| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [prep] a time | 382 |
|
| 2 | [prep] a short time | 376 |
|
| 3 | [adv] [prep] a short | 152 |
|
| 4 | [adv] a short time | 95 |
|
