| Value | Category | Cases | |
|---|---|---|---|
| 1 | Most important | 83268 |
48%
|
| 2 | relating to known | 54510 |
31.4%
|
| 3 | by heart | 35744 |
20.6%
|
| 7 | N/A | 93160 | |
| 8 | Invalid | 1228 | |
| 9 | Missing | 3413 |