| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] period [prep] | 1333 |
|
| 2 | in a period [prep] | 126 |
|
| 3 | in a [adj] [prep] | 110 |
|
| 4 | in a [adj] period | 109 |
|
| 5 | in [adj] period [prep] | 86 |
|
