| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] difficult [verb] [conj] | 382 |
|
| 2 | [adv] difficult [verb] [coord] | 136 |
|
| 3 | [adv] [adj] [verb] but | 69 |
|
| 4 | [adv] difficult [verb] but | 13 |
|
| 5 | [adv] difficult [verb] but | 12 |
|
