| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] [prep] a period | 60 |
|
| 2 | [adj] over a period | 20 |
|
| 3 | [adj] for a period | 17 |
|
| 4 | [adj] in a period | 8 |
|
| 5 | [adj] during a period | 6 |
|
