| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very difficult | 6 |
18.8%
|
| 2 | Difficult | 5 |
15.6%
|
| 3 | Normal | 8 |
25%
|
| 4 | Easy | 11 |
34.4%
|
| 5 | Very easy | 2 |
6.3%
|
| 11 | .F | 179 |