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“(a1) such sums as, in the opinion of the Commissioners, represent the value of services provided by the Commissioners by way of plant, machinery, vehicles, tools, stores, spare parts and other engineering equipment, and supplies for the purposes of the maintenance of the said drainage works, and
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(a2) such sums as, in the opinion of the Commissioners, represent the annual value of premises provided and maintained by the Commissioners in the locality served by the said drainage works for the purposes of the maintenance of the said drainage works, and”.
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