| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult [to-vb] [coord] [art] [noun] | 18 |
|
| 2 | difficult [to-vb] [coord] the [noun] | 15 |
|
| 3 | difficult [to-vb] and [art] [noun] | 13 |
|
| 4 | difficult [to-vb] [coord] [art] [noun sg] | 13 |
|
| 5 | difficult [to-vb] [coord] [art] [noun pl] | 5 |
|
