| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] period [prep] | 1333 |
|
| 2 | be a [adj] [prep] | 432 |
|
| 3 | be a period [prep] | 179 |
|
| 4 | be a [adj] period | 126 |
|
| 5 | be [adj] period [prep] | 11 |
|
