| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not [adv] difficult [to-vb] | 55 |
|
| 2 | not too difficult [to-vb] | 32 |
|
| 3 | not too difficult [to-vb] | 32 |
|
| 4 | not so difficult [to-vb] | 5 |
|
| 5 | not [adv] difficult to see | 5 |
|
| 6 | not so difficult [to-vb] | 5 |
|
