| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] [noun pl] [prep] a [adj] | 459 |
|
| 2 | [noun pl] [prep] a [adj] period | 200 |
|
| 3 | [to-vb] [prep] a [adj] period | 30 |
|
| 4 | [to-vb] [noun pl] [prep] [adj] period | 8 |
|
