| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [vb past] [prep] a | 9556 |
|
| 2 | [noun] [prep] a period | 832 |
|
| 3 | [vb past] [prep] a period | 62 |
|
| 4 | [noun] [vb past] a period | 34 |
|
