| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] period | 1820 |
|
| 2 | go [prep] a [adj] | 1450 |
|
| 3 | go [prep] a period | 39 |
|
| 4 | go [prep] [adj] period | 10 |
|
