| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] a short period | 48 |
|
| 2 | [noun] [prep] such a short | 35 |
|
| 3 | [prep] such a short period | 9 |
|
| 4 | [noun] [prep] such a period | 8 |
|
