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NCABC
EQBA assumption
EQAB lemma:equalitysymmetric
COABC defn:collinear
NEBA reductio
EQCB assumption
COCBA defn:collinear
COABC lemma:collinearorder
NECB reductio
ANBEBAE+EEAECB lemma:extension
EQBC assumption
COABC defn:collinear
NCABC
NEBC reductio
NEAB lemma:inequalitysymmetric
ANBEBCF+EECFAB lemma:extension
BEBCF
EECFAB
EEBAFC lemma:doublereverse
EEAECB
BEBAE
BEFCB axiom:betweennesssymmetry
EEBEFB cn:sumofparts
EEFBBF cn:equalityreverse
EEBEBF lemma:congruencetransitive
EEBFBE lemma:congruencesymmetric
EEEFFE cn:equalityreverse
RABAE lemma:ray4
RABCF lemma:ray4
EAABCCBA defn:equalangles
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