| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at a [adj] level [prep] | 170 |
|
| 2 | [vb -s] a [adj] level [prep] | 67 |
|
| 3 | [vb -s] at a [adj] level | 20 |
|
| 4 | [vb -s] at [adj] level [prep] | 15 |
|
