| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult [to-vb] [noun pl] [conj] the | 5 |
|
| 2 | difficult [to-vb] [noun pl] [conj] [art] | 5 |
|
| 3 | difficult [to-vb] [noun pl] [conj] the | 5 |
|
