| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] difficult [verb] | 3357 |
|
| 2 | [adv] difficult [to-vb] | 3329 |
|
| 3 | [adv] [adj] to make | 731 |
|
| 4 | [adv] difficult to make | 74 |
|
| 5 | [adv] difficult make | 71 |
|
