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OSPABQ
ANBEPRQ+COABR+NCABP defn:oppositeside
BEPRQ
COABR
NCABP
EQAB assumption
COABP defn:collinear
NEAB reductio
BEQRP axiom:betweennesssymmetry
COABQ assumption
COPRQ defn:collinear
COABR
COBQR lemma:collinear4
COQRB lemma:collinearorder
COQRP lemma:collinearorder
NEQR lemma:betweennotequal
CORBP lemma:collinear4
CORBA lemma:collinearorder
cases COAPB:EQRB|NERB
case 1:EQRB
COPBQ cn:equalitysub
COBQP lemma:collinearorder
COBQA lemma:collinearorder
NERQ lemma:betweennotequal
NEBQ cn:equalitysub
COQPA lemma:collinear4
COQPB lemma:collinearorder
NEPQ lemma:betweennotequal
NEQP lemma:inequalitysymmetric
COPAB lemma:collinear4
COAPB lemma:collinearorder
qedcase
case 2:NERB
COBPA lemma:collinear4
COAPB lemma:collinearorder
qedcase
COAPB cases
COABP lemma:collinearorder
NCABQ reductio
OSQABP defn:oppositeside
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