| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a brief period [prep] [noun sg] | 25 |
|
| 2 | a brief period of [noun] | 23 |
|
| 3 | a brief period [prep] [noun prp] | 9 |
|
| 4 | a brief period in [noun] | 5 |
|
