| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [noun] [prep] a [adj] | 16774 |
|
| 2 | [noun] [prep] a [adj] period | 868 |
|
| 3 | [prep] [noun] [prep] [adj] period | 169 |
|
| 4 | [prep] [noun] [prep] a period | 155 |
|
