| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been used [prep] [adj] effect | 8 |
|
| 2 | [verb] been used [prep] [adj] effect | 8 |
|
| 3 | been used [prep] [adj] effect [prep] | 5 |
|
| 4 | been used [prep] [adj] effect [prep] | 5 |
|
