| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | more difficult [to-vb] [is] [art] | 8 |
|
| 2 | more difficult [to-vb] [is] the | 8 |
|
| 3 | more difficult [to-vb] [is] [art] | 8 |
|
| 4 | more difficult [to-vb] [is] the | 8 |
|
