| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a short period of | 61 |
|
| 2 | [prep] a short period of | 61 |
|
| 3 | [prep] a short period of | 55 |
|
| 4 | for a short period of | 23 |
|
| 5 | for a short period of | 23 |
|
| 6 | in a short period of | 10 |
|
| 7 | in a short period of | 10 |
|
| 8 | over a short period of | 8 |
|
| 9 | over a short period of | 8 |
|
| 10 | within a short period of | 7 |
|
| 11 | within a short period of | 7 |
|
| 12 | after a short period of | 6 |
|
| 13 | after a short period of | 6 |
|
| 14 | [prep] a shorter period of | 6 |
|
