U.S. note 15(c)
(c) The quantitative limitations that may be established under any of subheadings 9903.18.01 through 9903.18.10 shall apply to sugar, syrups and molasses described therein during any effective period announced in the Federal Register by the United States Trade Representative for such a subheading in any year, during which period only the aggregate quantity of the specified goods shall be allowed entry into the customs territory of the United States. Such limitation shall apply notwithstanding any other quantitative limitation on such goods that may be provided for in the tariff schedule and the availability of any quantitative limitation set forth for such goods in chapter 17 or chapter 21 of the tariff schedule or allocation thereof. Any quantity set forth in a notice issued by the United States Trade Representative for any subheading specified herein may be allocated among supplying countries and areas and shall thereby supersede any quantity or allocation that may have been announced under additional U.S. note 5 to chapter 17.