| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a brief period [prep] | 63 |
|
| 2 | a brief period [prep] | 63 |
|
| 3 | a [adj] period during | 24 |
|
| 4 | a brief [noun sg] during | 11 |
|
| 5 | a brief [noun] during | 11 |
|
| 6 | [art] brief period during | 7 |
|
| 7 | a brief period during | 7 |
|
| 8 | a brief period during | 7 |
|
| 9 | a brief period during | 7 |
|
| 10 | [art] brief period during | 7 |
|
