| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | an [noun] [prep] [noun] | 19295 |
|
| 2 | an [noun] [prep] a | 4428 |
|
| 3 | [noun] [prep] [noun] a | 2912 |
|
| 4 | an [noun] [noun] a | 23 |
|
