lispdoc - results for set-exclusive-or

(set-exclusive-or list1 list2 &key key (test #'eql testp) (test-not #'eql notp))
Function: Return new list of elements appearing exactly once in LIST1 and LIST2.
 Mentioned in:
CLtL2 - 15.5. Using Lists as Sets
HyperSpec - Function SET-EXCLUSIVE-OR, NSET-EXCLUSIVE-OR
PCL - sets
(nset-exclusive-or list1 list2 &key key (test #'eql testp)
 (test-not #'eql notp))
Function: Destructively return a list with elements which appear but once in LIST1 and LIST2.
 Mentioned in:
CLtL2 - 15.5. Using Lists as Sets
HyperSpec - Function SET-EXCLUSIVE-OR, NSET-EXCLUSIVE-OR