| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] [to-vb] [adj] [noun] [prep] | 4604 |
|
| 2 | difficult [verb] [adj] [noun] [prep] | 213 |
|
| 3 | difficult [to-vb] [adj] [noun] [prep] | 209 |
|
