| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at a [adj] [noun sg] | 7396 |
|
| 2 | [prep] a certain [noun sg] | 1991 |
|
| 3 | at a certain [noun] | 164 |
|
| 4 | at [art] certain [noun sg] | 164 |
|
| 5 | at [art] certain [noun sg] | 164 |
|
| 6 | at a certain [noun sg] | 163 |
|
