Logiweb bibliography of propositional calculus

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[0] propositional calculus

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The pyk compiler, version 0.grue.20050502+ by Klaus Grue GRD-2005-06-02.UTC:18:16:36.700631 = MJD-53523.TAI:18:17:08.700631 = LGT-4624453028700631e-6