theorem
  for S being satisfying_CongruenceIdentity
              satisfying_SegmentConstruction
              satisfying_BetweennessIdentity
              satisfying_Pasch
              TarskiGeometryStruct
  for a,b,c being POINT of S st Collinear a,b,c holds
  Collinear b,c,a & Collinear c,a,b & Collinear c,b,a &
  Collinear b,a,c & Collinear a,c,b by Satz3p2;
