(set-logic QF_UF)
(set-info :source |
Generating minimum transitivity constraints in P-time for deciding Equality Logic,
Ofer Strichman and Mirron Rozanov,
SMT Workshop 2005.

Translator: Leonardo de Moura. |)
(set-info :smt-lib-version 2.0)
(set-info :category "crafted")
(set-info :status unsat)
(declare-sort U 0)
(declare-fun x0 () U)
(declare-fun y0 () U)
(declare-fun z0 () U)
(declare-fun x1 () U)
(declare-fun y1 () U)
(declare-fun z1 () U)
(declare-fun x2 () U)
(declare-fun y2 () U)
(declare-fun z2 () U)
(declare-fun x3 () U)
(declare-fun y3 () U)
(declare-fun z3 () U)
(declare-fun x4 () U)
(declare-fun y4 () U)
(declare-fun z4 () U)
(assert
 (and
  (or (and (= x0 y0) (= y0 x1)) (and (= x0 z0) (= z0 x1)))
  (or (and (= x1 y1) (= y1 x2)) (and (= x1 z1) (= z1 x2)))
  (or (and (= x2 y2) (= y2 x3)) (and (= x2 z2) (= z2 x3)))
  (or (and (= x3 y3) (= y3 x4)) (and (= x3 z3) (= z3 x4)))
  (not (= x1 x4))))
(check-sat)
(exit)
; :status unsat