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COABC
EEABab
EEACac
EEBCbc
EECBBC cn:equalityreverse
EECBbc lemma:congruencetransitive
EEbccb cn:equalityreverse
EECBcb lemma:congruencetransitive
EEabba cn:equalityreverse
EEABba lemma:congruencetransitive
EEABBA cn:equalityreverse
EEBAAB lemma:congruencesymmetric
EEBAba lemma:congruencetransitive
OREQAB|EQAC|EQBC|BEBAC|BEABC|BEACB defn:collinear
cases COabc:EQAB|EQAC|EQBC|BEBAC|BEABC|BEACB
case 1: EQAB
EEABab
EEAAab cn:equalitysub
EEabAA lemma:congruencesymmetric
NEab assumption
NEAA axiom:nocollapse
EQAA cn:equalityreflexive
EQab reductio
COabc defn:collinear
qedcase
case 2: EQAC
EEACac
EEAAac cn:equalitysub
EEacAA lemma:congruencesymmetric
NEac assumption
NEAA axiom:nocollapse
EQAA cn:equalityreflexive
EQac reductio
COabc defn:collinear
qedcase
case 3: EQBC
EEBCbc
EEBBbc cn:equalitysub
EEbcBB lemma:congruencesymmetric
NEbc assumption
NEBB axiom:nocollapse
EQBB cn:equalityreflexive
EQbc reductio
COabc defn:collinear
qedcase
case 4: BEBAC
BEbac lemma:betweennesspreserved
COabc defn:collinear
qedcase
case 5: BEABC
BEabc lemma:betweennesspreserved
COabc defn:collinear
qedcase
case 6: BEACB
BEacb lemma:betweennesspreserved
COabc defn:collinear
qedcase
COabc cases
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