| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] a [adj] | 122273 |
|
| 2 | [prep] a [adj] period | 1796 |
|
| 3 | [noun] [prep] [adj] period | 1256 |
|
| 4 | [noun] [prep] a period | 832 |
|
| 5 | [noun] a [adj] period | 14 |
|
