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 Th15:
 card(i1 ';' i2 ';' i3 ';' i4 ';' i5) = 6
proof
 thus card(i1 ';' i2 ';' i3 ';' i4 ';' i5)
    = card(i1 ';' i2 ';' i3 ';' i4) + 1 by Th11
   .= 5 + 1 by Th14
   .= 6;
end;
