| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [adj] [prep] a period | 17 |
|
| 2 | [prep] [adj] [prep] a period | 17 |
|
| 3 | [prep] [adj] [prep] a period | 17 |
|
| 4 | [prep] [num] [prep] a period | 10 |
|
| 5 | in [adj] [prep] a period | 8 |
|
| 6 | in [adj] [prep] a period | 8 |
|
| 7 | [prep] [adj] for a period | 7 |
|
| 8 | [prep] [adj] [prep] a period | 5 |
|
