reserve l, m, n for Nat,
  i,j,k for Instruction of SCM+FSA,
  I,J,K for Program of SCM+FSA;
reserve a,b for Int-Location,
  f for FinSeq-Location,
  s,s1,s2 for State of SCM+FSA;

theorem
 card(i ";" j) = 4
 proof
  thus card(i ";" j) = card Macro i + card Macro j by Th11
     .= card Macro i + 2 by COMPOS_1:56
     .= 2 + 2 by COMPOS_1:56
     .= 4;
 end;
