| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [det] [noun] | 6833 |
|
| 2 | [prep] a [noun] at | 4464 |
|
| 3 | [prep] [det] [noun] at | 2017 |
|
| 4 | a [det] [noun] at | 244 |
|
