| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [det] [noun] [prep] a [adj] | 3171 |
|
| 2 | [noun] [prep] a [adj] period | 704 |
|
| 3 | [det] [noun] [prep] a period | 37 |
|
| 4 | [det] [prep] a [adj] period | 12 |
|
