| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [to-vb] [art] | 11162 |
|
| 2 | [adv] difficult [to-vb] | 3329 |
|
| 3 | difficult [to-vb] [art] | 1328 |
|
| 4 | [adv] difficult [art] | 34 |
|
