| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] [noun] [prep] a | 17801 |
|
| 2 | [prep] [noun] [prep] a period | 155 |
|
| 3 | [noun] [noun] [prep] a period | 102 |
|
| 4 | [noun] [prep] [noun] [prep] period | 25 |
|
