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CVC4 is an efficient open-source automatic theorem prover for satisfiability modulo theories (SMT) problems.

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(set-info :smt-lib-version 2.6)
(set-logic ALL)
(set-info :status sat)
(set-option :strings-exp true)
(declare-fun x () String)

(assert
(not (= (str.in_re x (re.++ (re.++ re.allchar  re.allchar ) (re.* re.allchar ))) (not (str.in_re x (re.* (str.to_re "A")))))
))

(check-sat)

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