| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [adj] a period | 20 |
|
| 2 | [prep] [det] a period | 19 |
|
| 3 | [prep] such a period | 18 |
|
| 4 | [prep] such a period | 18 |
|
| 5 | in [adj] a period | 5 |
|
| 6 | of [adj] a period | 5 |
|
| 7 | in [adj] a period | 5 |
|
| 8 | of [adj] a period | 5 |
|
| 9 | over [adj] a period | 5 |
|
| 10 | over [adj] a period | 5 |
|
