| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [prep] [art] period of | 137 |
|
| 2 | [prep] [art] short period of | 71 |
|
| 3 | [adv] [prep] [art] short period | 28 |
|
| 4 | [adv] [art] short period of | 9 |
|
