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EAABCabc
ANRABAU+RABCV+RAbau+RAbcv+EEBUbu+EEBVbv+EEUVuv+NCABC defn:equalangles
RABAU
RABCV
RAbau
RAbcv
EEBUbu
EEBVbv
EEUVuv
NCABC
NEba lemma:ray2
NEab lemma:inequalitysymmetric
EEbuBU lemma:congruencesymmetric
EEbvBV lemma:congruencesymmetric
COBAU lemma:rayimpliescollinear
COBCV lemma:rayimpliescollinear
CObau lemma:rayimpliescollinear
CObcv lemma:rayimpliescollinear
COabu lemma:collinearorder
COabc assumption
CObuc lemma:collinear4
COcbu lemma:collinearorder
COcbv lemma:collinearorder
NEbc lemma:ray2
NEcb lemma:inequalitysymmetric
CObuv lemma:collinear4
EEbuBU
EEbvBV
EEuvUV lemma:congruencesymmetric
COBUV lemma:collinearitypreserved
COBAU
COBUA lemma:collinearorder
NEBU lemma:raystrict
COUVA lemma:collinear4
COUVB lemma:collinearorder
cases COVAB:EQUV|NEUV
case 1:EQUV
COBAU
COBAV cn:equalitysub
COVAB lemma:collinearorder
qedcase
case 2:NEUV
COVAB lemma:collinear4
qedcase
COVAB cases
COVBA lemma:collinearorder
COVBC lemma:collinearorder
NEBV lemma:raystrict
NEVB lemma:inequalitysymmetric
COBAC lemma:collinear4
COABC lemma:collinearorder
NCabc reductio
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