
theorem
  for x,y,z being set holds [<*x,y*>,xor2] in InnerVertices GFA3AdderStr
  (x,y,z) & GFA3AdderOutput(x,y,z) in InnerVertices GFA3AdderStr(x,y,z)
proof
  let x,y,z be set;
  set S0 = GFA0AdderStr(x,y,z);
  GFA3AdderStr(x,y,z) = S0;
  hence thesis by Th26;
end;
