| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] for [noun] | 18682 |
|
| 2 | [adj] for [noun] | 14160 |
|
| 3 | difficult [prep] [noun] | 490 |
|
| 4 | difficult [prep] [noun] | 490 |
|
| 5 | difficult for [noun] | 357 |
|
| 6 | difficult for [noun] | 357 |
|
