| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult [verb] than [art] [adj] [noun sg] | 5 |
|
| 2 | difficult [to-vb] than [art] [adj] [noun sg] | 5 |
|
| 3 | difficult [verb] than [art] [adj] [noun sg] | 5 |
|
