Misleading question stem

Hi Jingwenbb, thanks for the question. When I started my games journey I ran into the same issue as well. However, unless we are able to infer from other rules or rule interactions that each variable can be placed once, then we cannot assume that. So unless a rule states that K can only be in Sales, then K would have the option to be in other groups as well. I hope this helps. Please let me know if you have any other questions or would like me to elaborate further!