Sindbad~EG File Manager

RRABC
MIAEa
MIBEb
MICEc
ANBEABD+EEABDB+EEACDC+NEBC  defn:rightangle
NEBC
BEABD
EEACDC
NEBC
NCABC   lemma:rightangleNC
NEAC    lemma:NCdistinct
NEAB   lemma:betweennotequal
EEABab  lemma:pointreflectionisometry
EEACac  lemma:pointreflectionisometry
EEBCbc  lemma:pointreflectionisometry
cases RRabc:EQDE|NEDE
 case 1:EQDE 
  EEBEEb  defn:midpoint
  EECEEc  defn:midpoint
  BEABD   
  EEABab
  EEAEEa  defn:midpoint
  EEADDa  cn:equalitysub
  EEADaD  lemma:congruenceflip
  EEBEEb  defn:midpoint
  EEBDDb  cn:equalitysub
  EEBDbD  lemma:congruenceflip
  EEDBDb  lemma:congruenceflip
  BEabD   lemma:betweennesspreserved
  EEabAB  lemma:congruencesymmetric
  EEABDB   
  EEabDB  lemma:congruencetransitive
  EEabDb lemma:congruencetransitive
  EEacAC  lemma:congruencesymmetric
  EEACDC  
  EEacDC  lemma:congruencetransitive
  EECEEc  defn:midpoint
  EECDDc  cn:equalitysub
  EEDCDc  lemma:congruenceflip
  EEacDc  lemma:congruencetransitive
  NEbc    axiom:nocollapse
  RRabc   defn:rightangle
 qedcase
 case 2:NEDE
  ANBEDEd+EEEdDE  lemma:extension
  BEDEd
  EEEdDE
  EEEDdE  lemma:doublereverse
  EEDEEd  lemma:congruenceflip
  MIDEd   defn:midpoint
  NEBD    lemma:betweennotequal 
  EEBDbd  lemma:pointreflectionisometry
  EEACDC 
  NEDC    axiom:nocollapse
  EEDCdc  lemma:pointreflectionisometry
  EEacAC  lemma:congruencesymmetric  
  EEacDC  lemma:congruencetransitive
  EEacdc  lemma:congruencetransitive
  NEbc    axiom:nocollapse
  BEABD
  EEABab
  NEAD    lemma:betweennotequal
  EEADad  lemma:pointreflectionisometry
  EEBDbd
  BEabd  lemma:betweennesspreserved
  EEabAB  lemma:congruencesymmetric
  EEABDB   
  EEabDB  lemma:congruencetransitive
  EEDBdb  lemma:congruenceflip
  EEabdb  lemma:congruencetransitive
  EEacdc
  NEbc
  RRabc   defn:rightangle
 qedcase
RRabc  cases