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{Jim, Serena}
=={{header|Mathematica}}/{{header|Wolfram Language}}==
Mathematica has built-in support for operations on sets, using its generic symbolic lists. This function finds the entries in each list that are not present in the intersection of the two lists.
<lang Mathematica>SymmetricDifference[x_List,y_List] := Join[Complement[x,Intersection[x,y]],Complement[y,Intersection[x,y]]]</lang>
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