| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | in a [adj] period of time | 15 |
|
| 2 | in a [adj] period [prep] time | 14 |
|
| 3 | in a short period [prep] time | 9 |
|
| 4 | in a short period [prep] time | 8 |
|
