| Value | Category | Cases | |
|---|---|---|---|
| 2 | Is Allowed | 7353 |
18.7%
|
| 4 | Is Usually Not Allowed, With Exceptions | 5576 |
14.1%
|
| 6 | Is Never Allowed | 18668 |
47.4%
|
| 8 | There Is No Standard | 7828 |
19.9%
|