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TPABcd
COcdC
NECd
NEcd defn:tarski_parallel
OREQcd|EQcC|EQdC|BEdcC|BEcdC|BEcCd defn:collinear
cases TPABCd:EQcd|EQcC|EQdC|BEdcC|BEcdC|BEcCd
case 1:EQcd
NOTPABCd assumption
NEcd
TPABCd reductio
qedcase
case 2:EQcC
TPABCd cn:equalitysub
qedcase
case 3:EQdC
NOTPABCd assumption
EQCd lemma:equalitysymmetric
TPABCd reductio
qedcase
case 4:BEdcC
BECcd axiom:betweennesssymmetry
TPABCd lemma:parallelcollinear1
qedcase
case 5:BEcdC
BECdc axiom:betweennesssymmetry
TPABdc lemma:tarskiparallelflip
TPABCc lemma:parallelcollinear1
TPABcC lemma:tarskiparallelflip
TPABdC lemma:parallelcollinear2
TPABCd lemma:tarskiparallelflip
qedcase
case 5:BEcCd
TPABCd lemma:parallelcollinear2
qedcase
TPABCd cases
TPABCd
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