josh wrote: ↑October 17th, 2019, 9:03 am
First, you can avoid two digit codes by using all the characters available: capital letters (A-Z), lowercase letters (a-z), numbers (1-9) and even symbols ($,%,&,#...). With that you can have as many options as you would have with a two digit numeric code.
If you absolutely must use two digit codes see this post: viewtopic.php?f=10&t=2190 that gives the implementation of an ischecked function that can tell you if a two digit code was checked in a multiple response question. In the next version of CSPro the ischecked function will be built in to the language.