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REABCD ANRRDAB+RRABC+RRBCD+RRCDA+CRACBD defn:rectangle RRDAB RRABC RRBCD RRCDA CRACBD RRADC lemma:8.2 RRDCB lemma:8.2 RRCBA lemma:8.2 RRBAD lemma:8.2 ANBEAMC+BEBMD defn:cross BEAMC BEBMD BECMA axiom:betweennesssymmetry BEDMB axiom:betweennesssymmetry CRDBCA defn:cross ANRRADC+RRDCB+RRCBA+RRBAD+CRDBCA REDCBA defn:rectangle