| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] period | 1796 |
|
| 2 | [prep] a [adj] period | 1646 |
|
| 3 | [prep] a brief [noun] | 595 |
|
| 4 | [prep] a brief [noun sg] | 590 |
|
| 5 | [prep] [art] brief period | 66 |
|
| 6 | [prep] [art] brief period | 66 |
|
| 7 | [prep] a brief period | 60 |
|
| 8 | [prep] a brief period | 60 |
|
| 9 | [prep] a brief period | 60 |
|
