| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [vb pp] [prep] a | 14091 |
|
| 2 | [noun] [prep] a period | 832 |
|
| 3 | [vb pp] [prep] a period | 269 |
|
| 4 | [noun] [vb pp] [prep] period | 22 |
|
