| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] difficult at [art] | 6 |
|
| 2 | [adv] difficult at [art] | 6 |
|
| 3 | difficult [to-vb] at [art] | 17 |
|
| 4 | difficult [verb] at [art] | 17 |
|
| 5 | difficult [noun] at [art] | 9 |
|
| 6 | difficult [noun sg] at [art] | 8 |
|
| 7 | difficult at [art] [noun] | 10 |
|
| 8 | difficult at [art] [noun sg] | 9 |
|
| 9 | difficult at [art] moment | 5 |
|
| 10 | difficult at [art] moment | 5 |
|
