| Value | Category | Cases | |
|---|---|---|---|
| 1 | Visible but not used in this lesson | 27 |
22.7%
|
| 2 | Used in this lesson | 36 |
30.3%
|
| 3 | Not visible but available | 13 |
10.9%
|
| 4 | Not available | 43 |
36.1%
|