| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a relatively short period of | 14 |
|
| 2 | [prep] a relatively short period of | 14 |
|
| 3 | a relatively short period of [noun] | 16 |
|
| 4 | a relatively short period of [noun sg] | 16 |
|
| 5 | a relatively short period of time | 14 |
|
| 6 | a relatively short period of time | 14 |
|
