Avoid ambigous chararacters in the generated exam keys, such as l vs 1, o vs 0. There are some attempts online of sets of characters that are mostly unambigious, see this post and this post.

Submitted by D. Pelsmaeker on 4 October 2023 at 13:39

Given the fact that those keys only contain characters in range [0-9A-F], it’s unambiguous 😝. The exam sheets also explicitly mention this below the key:

Note that the character 0 is a zero, not a capital O.