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I am now experimenting with this at: https://github.com/barrycarter/bcapps/blob/master/MATHEMATICA/bc-solve-mathematica-104993.m which is currently just one line: card[HoldPattern[Union[a_,b_]]] = card[a] + card[b] - card[Intersection[a,b]] which yields this error: Intersection::normal: Nonatomic expression expected at position 1 in Intersection[a, ...



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