| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] not [verb] | 1885 |
|
| 2 | it [is] difficult [verb] | 1819 |
|
| 3 | it [is] difficult not | 36 |
|
| 4 | [is] difficult not [verb] | 33 |
|
| 5 | it difficult not [verb] | 6 |
|
