| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [not/n't] [adv] difficult [to-vb] | 59 |
|
| 2 | [not/n't] [adv] difficult [to-vb] | 59 |
|
| 3 | not [adv] difficult [to-vb] | 55 |
|
| 4 | [not/n't] too difficult [to-vb] | 35 |
|
| 5 | [not/n't] too difficult [to-vb] | 35 |
|
| 6 | [not/n't] so difficult [to-vb] | 5 |
|
| 7 | [not/n't] so difficult [to-vb] | 5 |
|
| 8 | [not/n't] [adv] difficult to see | 5 |
|
