4. The operator shall, in the case of any bets made by means of the totalisator on any race or combination of races,—N.I.
(a)deduct from the aggregate amount staked—
(i)any sums payable by the operator by way of the general betting duty in respect of those bets; and
(ii)subject to paragraph 5, the percentage specified in the notice posted in pursuance of paragraph 3; and
(b)subject to paragraphs 5 and 6, distribute the whole of the remainder of that amount among the persons making such of those bets as are winning bets.