Hello Arthur, Yes, you are correct that in order for this snippet of code to make sense, we should define the groupa, b, and c macros, which of course I did in my own program but just left out here. Also yes, this of course only performs one iteration whereas I was asking for multiple iterations. I am still working on exactly how to implement it in my code, but I inserted this snippet into a large macro do-loop in my code, and this snippet will randomly assign the groups in each iteration.
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