| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] [noun] [noun] | 28821 |
|
| 2 | [prep] [art] [adj] [noun] period | 764 |
|
| 3 | [prep] [art] [adj] [noun] period | 764 |
|
| 4 | [prep] a [adj] [noun] period | 344 |
|
