| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] n't [adv] difficult | 6 |
|
| 2 | it [is] n't [adv] difficult | 6 |
|
| 3 | it [is] n't difficult [verb] | 7 |
|
| 4 | it [is] n't difficult [to-vb] | 7 |
|
