| Value | Category | Cases | |
|---|---|---|---|
| 1 | Easy | 958 | 
                                    
                                    73.6%
                                 | 
| 2 | Difficult | 340 | 
                                    
                                    26.1%
                                 | 
| 8 | Not sure | 3 | 
                                    
                                    0.2%
                                 |