Sindbad~EG File Manager

TRABC
EAABCDEF
EABCAEFD
EEABDE
NCABC  defn:triangle
EAABCABC  lemma:equalanglesreflexive
NEAB  lemma:angledistinct
NEBA  lemma:inequalitysymmetric
NEBC  lemma:angledistinct
NECB  lemma:inequalitysymmetric
NEAC  lemma:angledistinct
NECA  lemma:inequalitysymmetric
LTEFBC  assumption
 ANBEBHC+EEBHEF  defn:lessthan
 BEBHC
 EEBHEF
 EAABCABC  lemma:equalanglesreflexive
 EQAA  cn:equalityreflexive
 RABAA  lemma:ray4
 RABCH  lemma:ray4
 EAABCABH  lemma:equalangleshelper
 EAABHABC  lemma:equalanglessymmetric
 EAABHDEF  lemma:equalanglestransitive
 EEBAED  lemma:congruenceflip
 ANEEAHDF+EABAHEDF+EABHAEFD  proposition:04
 EAEFDBCA  lemma:equalanglessymmetric
 COACH   assumption
  COHCA   lemma:collinearorder
  COBHC   defn:collinear
  COHCB   lemma:collinearorder
  NEHC    lemma:betweennotequal
  COCAB   lemma:collinear4
  COABC   lemma:collinearorder
 NCACH     reductio
 TRACH     defn:triangle
 BECHB     axiom:betweennesssymmetry
 AOHCAAHB  proposition:16
 RACBH    lemma:ray4
 EQAA    cn:equalityreflexive
 RACAA    lemma:ray4
 COBCA  assumption
  COABC  lemma:collinearorder
 NCBCA reductio
 EABCABCA  lemma:equalanglesreflexive
 EABCAHCA  lemma:equalangleshelper
 AOBCAAHB  lemma:angleorderrespectscongruence2
 AOEFDAHB  lemma:angleorderrespectscongruence2
 EABHAEFD
 COAHB   assumption
  COHBA  lemma:collinearorder
  COBHC  defn:collinear
  COHBC  lemma:collinearorder
  NEBH   lemma:betweennotequal
  NEHB   lemma:inequalitysymmetric
  COBAC  lemma:collinear4
  COABC  lemma:collinearorder
 NCAHB   reductio
 EAAHBBHA  lemma:ABCequalsCBA
 EAAHBEFD   lemma:equalanglestransitive
 AOAHBAHB  lemma:angleorderrespectscongruence2
 NOAOAHBAHB  lemma:angletrichotomy
NOLTEFBC  reductio