| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] period in | 72 |
|
| 2 | [prep] a brief [noun] in | 53 |
|
| 3 | [prep] a brief period [prep] | 36 |
|
| 4 | [prep] a brief period [prep] | 36 |
|
| 5 | [prep] [art] brief period in | 10 |
|
| 6 | [prep] [art] brief period in | 10 |
|
| 7 | [prep] a brief period in | 9 |
|
| 8 | [prep] a brief period in | 9 |
|
| 9 | [prep] a brief period in | 9 |
|
