| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] a [adj] period [prep] | 177 |
|
| 2 | [verb] by a period [prep] | 33 |
|
| 3 | by a [adj] period [prep] | 16 |
|
| 4 | [verb] by a [adj] [prep] | 15 |
|
| 5 | [verb] by a [adj] period | 15 |
|
