reserve S for with_non_trivial_Instructions COM-Struct;
reserve i,j,k for No-StopCode Instruction of S,
        I,J,K for MacroInstruction of S;
reserve i1,i2,i3,i4,i5,i6 for No-StopCode Instruction of S;

theorem Th14:
 card(i1 ';' i2 ';' i3 ';' i4) = 5
proof
 thus card(i1 ';' i2 ';' i3 ';' i4)
    = card(i1 ';' i2 ';' i3) + 1 by Th11
   .= 4 + 1 by Th13
   .= 5;
end;
