reserve s for State of SCM+FSA,
  a, c for read-write Int-Location,
  aa, bb, cc,
  dd, x for Int-Location,
  f for FinSeq-Location,
  I, J for MacroInstruction of SCM+FSA,
  Ig for good MacroInstruction of SCM+FSA,
  i, k for Nat,
  p for Instruction-Sequence of SCM+FSA;

theorem Th2:
  Stop SCM+FSA does not refer aa
proof
A1: rng Stop SCM+FSA = {halt SCM+FSA} by AFINSQ_1:33;
  let i be Instruction of SCM+FSA;
  assume i in rng Stop SCM+FSA;
  then i = halt SCM+FSA by A1,TARSKI:def 1;
  hence thesis;
end;
