| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [det] [noun] [prep] a [adj] [noun] | 3600 |
|
| 2 | [adj] [noun] [prep] a [adj] period | 272 |
|
| 3 | [det] [noun] [prep] [art] [adj] period | 95 |
|
| 4 | [det] [noun] [prep] a [adj] period | 45 |
|
