| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] it is difficult not [verb] | 8 |
|
| 2 | [coord] it is difficult not [to-vb] | 8 |
|
| 3 | [coord] it is difficult not [verb] | 8 |
|
| 4 | [coord] it is difficult not [verb] | 8 |
|
| 5 | and it is difficult not [verb] | 5 |
|
