| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] [prep] a short period | 12 |
|
| 2 | [adj] [prep] [art] short period | 12 |
|
| 3 | [adj] [prep] a short period | 12 |
|
| 4 | [adj] [prep] [art] short period | 8 |
|
| 5 | [adj] for [art] short period | 7 |
|
