| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] a [noun] | 199651 |
|
| 2 | [noun] [prep] a [noun sg] | 187993 |
|
| 3 | [noun] [prep] [art] period | 2807 |
|
| 4 | [noun] [prep] a period | 833 |
|
