| Value | Category | Cases | |
|---|---|---|---|
| 1 | textbook | 1 |
33.3%
|
| 2 | multimedia | 0 |
0%
|
| 3 | workbook | 1 |
33.3%
|
| 4 | 1 |
33.3%
|
|
| Sysmiss | 47 |