reserve I for Element of Segm 8,
  S for non empty 1-sorted,
  t for Element of S,
  x for set,
  k for Element of NAT;
 reserve R for Ring, T for InsType of SCM-Instr R;
reserve R for Ring,
  r for Element of R,
  a, b, c, d1, d2 for Data-Location of R,
  i1 for Nat;
reserve s for State of SCM R;

theorem
  x is Data-Location of R iff x in Data-Locations SCM R
 proof
   Data-Locations SCM R = Data-Locations SCM by Th22;
  hence thesis by Th1;
 end;
