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EEABab
EEACac
BEABC
BEabc
cases EEBCbc:EQBA|NEBA
case 1: EQBA
EEAAab cn:equalitysub
EEabAA lemma:congruencesymmetric
NEab assumption
NEAA axiom:nocollapse
EQAA cn:equalityreflexive
EQab reductio
EEACAC cn:congruencereflexive
EEBCAC cn:equalitysub
EEBCac lemma:congruencetransitive
EEbcbc cn:congruencereflexive
EEbcac cn:equalitysub
EEacbc lemma:congruencesymmetric
EEBCbc lemma:congruencetransitive
qedcase
case 2: NEBA
EQCA assumption
BEABA cn:equalitysub
NOBEABA axiom:betweennessidentity
NECA reductio
NEAC lemma:inequalitysymmetric
ANBECAE+EEAEAC lemma:localextension
EEACac
BECAE
NEAC lemma:inequalitysymmetric
NEac axiom:nocollapse
NEca lemma:inequalitysymmetric
ANBEcae+EEaeac lemma:localextension
BEcae
EEAEAC
EEaeac
EEEAAE cn:equalityreverse
EEEAAC lemma:congruencetransitive
EEACac
EEEAac lemma:congruencetransitive
EEeaae cn:equalityreverse
EEeaac lemma:congruencetransitive
EEacea lemma:congruencesymmetric
EEEAac lemma:congruencetransitive
EEEAea lemma:congruencetransitive
BEEAC axiom:betweennesssymmetry
BEeac axiom:betweennesssymmetry
EEECec cn:sumofparts
EEECec
EEEAea
EEABab
BEEAC
BEABC
BEEAB axiom:innertransitivity
BEeab axiom:innertransitivity
EECBcb axiom:5-line
EEbcBC lemma:doublereverse
EEBCbc lemma:congruencesymmetric
qedcase
EEBCbc cases
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