| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] is difficult for | 140 |
|
| 2 | [pers pn] is more difficult | 77 |
|
| 3 | [pers pn] more difficult for | 69 |
|
| 4 | is more difficult for | 12 |
|
