| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at [art] [adj -est] levels | 37 |
|
| 2 | at the [adj -est] levels | 37 |
|
| 3 | at the [adj -est] levels | 37 |
|
| 4 | at [art] highest levels | 27 |
|
| 5 | at [art] lowest levels | 9 |
|
