| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | engineer [vb mod] be aware of | 5 |
|
| 2 | engineers [vb mod] be aware [prep] | 5 |
|
| 3 | engineer [vb mod] be aware [prep] | 5 |
|
| 4 | engineer [vb mod] be aware of | 5 |
|
