| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] difficult [to-vb] just how [adj] | 7 |
|
| 2 | be difficult [to-vb] just how [adj] | 7 |
|
| 3 | [is] difficult [to-vb] just how [adj] | 7 |
|
| 4 | is difficult [to-vb] just how [adj] | 5 |
|
