| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] difficult [to-vb] and | 109 |
|
| 2 | more difficult [verb] and | 34 |
|
| 3 | very difficult [verb] and | 19 |
|
| 4 | extremely difficult [verb] and | 10 |
|
| 5 | [adv] difficult to understand and | 8 |
|
| 6 | [adv] difficult understand and | 8 |
|
| 7 | notoriously difficult [verb] and | 6 |
|
| 8 | most difficult [verb] and | 6 |
|
| 9 | [adv] difficult to control and | 5 |
|
| 10 | [adv] difficult control and | 5 |
|
