| Value | Category | Cases | |
|---|---|---|---|
| 1 | Visible but not used in this lesson | 41 | 
                                
                                34.5%
                             | 
| 2 | Used in this lesson | 19 | 
                                
                                16%
                             | 
| 3 | Not visible but available | 11 | 
                                
                                9.2%
                             | 
| 4 | Not available | 48 | 
                                
                                40.3%
                             |