| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [noun] [prep] [noun] | 199407 |
|
| 2 | at [noun] [prep] [noun] | 7043 |
|
| 3 | at a [noun] [prep] | 5607 |
|
| 4 | at a [noun] [noun] | 2956 |
|
