(set-logic AUFLIRA)
(set-info :smt-lib-version 2.0)
(set-info :category "industrial")
(set-info :status sat)
(declare-sort U 0)
(declare-fun a () U)
(declare-fun b () U)
(declare-fun c () U)
(declare-fun f (U) U)
(assert (and (= a b) (forall ((x U)) (=> (or (= (f x) c) (= x a)) (= x b)))))
(check-sat)
(exit)