| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | more difficult [subord] [pron] | 77 |
|
| 2 | difficult [subord] [pron] is | 30 |
|
| 3 | more difficult [pron] is | 24 |
|
| 4 | more [subord] [pron] is | 13 |
|
