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(set-logic QF_S)
(set-info :status unsat)
;this option for experts only
(set-option :strings-alphabet-card 2)
(declare-fun x () String)
(declare-fun y () String)
(declare-fun z () String)
(declare-fun w () String)
(declare-fun i () Int)
(assert (= i 1))
(assert (= (str.len x) i))
(assert (= (str.len y) i))
(assert (= (str.len z) i))
(assert (= (str.len w) 2))
(assert (not (= x y)))
(assert (not (= x z)))
(assert (not (= z y)))
(check-sat)
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