| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] period of | 544 |
|
| 2 | [prep] a brief [noun] of | 145 |
|
| 3 | [prep] a brief [noun sg] of | 143 |
|
| 4 | [prep] a brief period [prep] | 36 |
|
| 5 | [prep] a brief period [prep] | 36 |
|
| 6 | [prep] [art] brief period of | 16 |
|
| 7 | [prep] [art] brief period of | 16 |
|
| 8 | [prep] a brief period of | 13 |
|
| 9 | [prep] a brief period of | 13 |
|
| 10 | [prep] a brief period of | 13 |
|
