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(set-logic ALL_SUPPORTED) (set-option :strings-exp true) (set-info :status sat) (declare-const x String) (declare-const y String) (assert (= (str.tolower x) "abcde")) (assert (= (str.tolower y) "abcde")) (assert (not (= x "abcde"))) (assert (not (= y "abcde"))) (assert (not (= x y))) (check-sat)