| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] [adv] [adj] [verb] [conj] | 86 |
|
| 2 | [conj] [adv] difficult [verb] [conj] | 18 |
|
| 3 | [coord] [adv] difficult [verb] [conj] | 15 |
|
