| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] period in | 109 |
|
| 2 | a short period in | 13 |
|
| 3 | a short period in | 13 |
|
| 4 | a brief period in | 11 |
|
| 5 | a brief period in | 11 |
|
| 6 | a long period in | 9 |
|
| 7 | a long period in | 7 |
|
