| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult [to-vb] [art] [noun] | 852 |
|
| 2 | [to-vb] [coord] [art] [noun] | 686 |
|
| 3 | difficult [to-vb] [coord] [art] | 28 |
|
| 4 | difficult [coord] [art] [noun] | 16 |
|
| 5 | difficult [to-vb] [coord] [noun] | 15 |
|
