Sindbad~EG File Manager
COABC
EEABab
EEBCbc
EEADad
EECDcd
EEACac
NEAC
OREQAB|EQAC|EQBC|BEBAC|BEABC|BEACB defn:collinear
OREQAB|EQBC|BEBAC|BEABC|BEACB
cases EEBDbd:EQAB|EQBC|BEBAC|BEABC|BEACB
case 1:EQAB
EEBBab cn:equalitysub
EEabBB lemma:congruencesymmetric
NEab assumption
NEBB axiom:nocollapse
EQBB cn:equalityreflexive
EQab reductio
EEBDad cn:equalitysub
EEBDbd cn:equalitysub
qedcase
case 2:EQBC
EEBBbc cn:equalitysub
EEbcBB lemma:congruencesymmetric
NEbc assumption
NEBB axiom:nocollapse
EQBB cn:equalityreflexive
EQbc reductio
EEBDcd cn:equalitysub
EEBDbd cn:equalitysub
qedcase
case 3:BEBAC
BECAB axiom:betweennesssymmetry
EECAca lemma:congruenceflip
EECBcb lemma:congruenceflip
BEcab lemma:betweennesspreserved
EEDBdb axiom:5-line
EEBDbd lemma:congruenceflip
qedcase
case 4:BEABC
BEabc lemma:betweennesspreserved
EEBDbd lemma:interior5
qedcase
case 5:BEACB
EECBcb lemma:congruenceflip
BEacb lemma:betweennesspreserved
EEDBdb axiom:5-line
EEBDbd lemma:congruenceflip
qedcase
EEBDbd cases
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