| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] short period of | 50 |
|
| 2 | relatively short period of | 21 |
|
| 3 | relatively short period of | 21 |
|
| 4 | very short period of | 19 |
|
| 5 | very short period of | 19 |
|
