| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] not difficult [to-vb] that | 16 |
|
| 2 | it is not difficult [verb] that | 15 |
|
| 3 | it [is] not difficult see that | 7 |
|
| 4 | it [is] not difficult to see that | 7 |
|
