
theorem
  for x,y,z being set holds [<*x,y*>,xor2c] in InnerVertices
GFA2AdderStr(x,y,z) & GFA2AdderOutput(x,y,z) in InnerVertices GFA2AdderStr(x,y,
  z)
proof
  let x,y,z be set;
  set S1 = GFA1AdderStr(x,y,z);
  GFA2AdderStr(x,y,z) = S1;
  hence thesis by Th57;
end;
