| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] at this [noun] | 179 |
|
| 2 | difficult [to-vb] this [noun] | 38 |
|
| 3 | difficult [to-vb] at [noun] | 16 |
|
| 4 | difficult [to-vb] at this | 9 |
|
| 5 | difficult at this [noun] | 6 |
|
