| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not [adv] [adj] [to-vb] | 934 |
|
| 2 | [adv] [adv] difficult [to-vb] | 463 |
|
| 3 | not [adv] difficult [to-vb] | 59 |
|
| 4 | [not/n't] [adv] difficult [to-vb] | 59 |
|
| 5 | not [adv] difficult [verb] | 55 |
|
