Description:
XOR's lists (<l1?> and <l2?> and possibly more) into a single list.
XOR keeps only the elements present in one list and not in the other one(s).
<test> is a function or function name for a binary comparison.
<key> is a name or function name to apply to the elements before comparison.
Ex. (x-xor '(1 2 3 4 5) '(4 5 6 7 8)) => (1 2 3 6 7 8)
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