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+GNU Aris is a sequential proof program, designed to assist anyone interested
+in solving logical proofs. Aris supports both propositional and predicate
+logic, as well as Boolean algebra and arithmetical logic in the form of
+abstract sequences. It uses a predefined set of both inference and equivalence
+rules, however gives the user options to use older proofs as lemmas, including
+Isabelle's Isar proofs.