| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] at a level | 56 |
|
| 2 | [verb] at a level | 56 |
|
| 3 | [vb pp] at a level | 36 |
|
| 4 | [v-ing] at a level | 9 |
|
| 5 | set at a level | 9 |
|
| 6 | set at a level | 9 |
|
| 7 | operate at a level | 5 |
|
