reserve a, b, d1, d2 for Data-Location,
  il, i1, i2 for Nat,
  I for Instruction of SCM,
  s, s1, s2 for State of SCM,
  T for InsType of the InstructionsF of SCM,
  k,k1 for Nat;

theorem
 T = 0 or ... or T = 8
proof
  consider y being object such that
A1: [T,y] in proj1 the InstructionsF of SCM by XTUPLE_0:def 12;
  consider x being object such that
A2: [[T,y],x] in the InstructionsF of SCM by A1,XTUPLE_0:def 12;
   reconsider I = [T,y,x] as Instruction of SCM by A2;
  T = InsCode I;
 hence thesis by AMI_5:5;
end;
