test/regress/regress0/distinct.smtv1.smt2

   1 (set-option :incremental false)
   2 (set-info :status unsat)
   3 (set-logic QF_UF)
   4 (declare-sort U 0)
   5 (declare-fun x () U)
   6 (declare-fun y () U)
   7 (declare-fun z () U)
   8 (check-sat-assuming ( (not (= (distinct x y z) (and (not (= x y)) (not (= x z)) (not (= y z))))) ))