| Value | Category | Cases | |
|---|---|---|---|
| 0 | easy | 4 |
0.1%
|
| 1 | moderate | 0 |
0%
|
| 2 | difficult | 22 |
0.4%
|
| 3 | not applicable | 4911 |
99.5%
|
| Sysmiss | 21 |