| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] on [prep] a [adj] | 462 |
|
| 2 | [verb] [prep] a [adj] period | 384 |
|
| 3 | on [prep] a [adj] period | 9 |
|
| 4 | [verb] on [prep] a period | 6 |
|
