| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] more difficult [to-vb] | 62 |
|
| 2 | and more difficult [to-vb] | 52 |
|
| 3 | and more difficult [to-vb] | 52 |
|
| 4 | but more difficult [to-vb] | 7 |
|
| 5 | but more difficult [to-vb] | 7 |
|
