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I have a questionare I am writing that I have several yes no questions, and some with yes, no, and

maybe.  I set up some exclusion groups awhile back but don't remember how I did it.  Could someone explain

in English, how to do it.  I compared everything in the new groups to look the same, grouped them, but still

if you click on the radio button each one will be filled in.  I can't get them to just allow one entry.

Can someone explain to me how to set up a group of radio buttons to only allow one entry for yes, no and maybe?