| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult [to-vb] the | 848 |
|
| 2 | [to-vb] [is] the | 220 |
|
| 3 | difficult [to-vb] [is] | 40 |
|
| 4 | difficult [is] the | 6 |
|
