| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who [verb] [been] concerned with | 5 |
|
| 2 | who [verb] [be] concerned with | 5 |
|
| 3 | who [verb] been concerned with | 5 |
|
| 4 | who [verb] be concerned with | 5 |
|
| 5 | who have [be] concerned with | 5 |
|
| 6 | who [verb] [be] concerned with | 5 |
|
