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(b) Preferences in force exclusively between two or more territories which on July 1, 1939, were connected by common sovereignty or relations of protection or suzerainty and which are listed in Annexes B, C, and D, subject to the conditions set forth therein ; (c) Preferences in force exclusively between the United States of America and the Republic of Cuba : (d) Preferences in force exclusively between neighbouring countries listed in Annexes E and F. 3. The margin of preference on any product in respect of which a preference is permitted under paragraph 2 of this Article but is not specifically set forth as a maximum margin of preference in the appropriate Schedule annexed to this Agreement shall not exceed — (a) In respect of duties or charges on any product described in such Schedule, the difference between the most-favoured-nation and preferential rates provided for therein ; if no preferential rate is provided for, the preferential rate shall for the purposes of this paragraph be taken to be that in force on April 10, 1947, and, if no most-favoured-nation rate is provided for, the margin shall not exceed the difference between the most-favoured-nation and preferential rates existing on April 10, 1947 : (b) In respect of duties or charges on any product not described in the appropriate Schedule, the difference between the most-favoured-nation and preferential rates existing on April 10, 1947. In the case of the contracting parties named in Annex G, the date of April 10, 1947, referred to in subparagraphs (a) and (b) of this paragraph shall be replaced by the respective dates set forth in that Annex. Article II Schedules of Concessions 1. (a) Each contracting party shall accord to the commerce of the other contracting parties treatment no less favourable than that provided for in the appropriate Part of the appropriate Schedule annexed to this Agreement. (5) The products described in Part I of the Schedule relating to any contracting party, which are the products of territories of other contracting parties, shall, on their importation into the territory to which the Schedule relates, and subject to the terms, conditions, or qualifications set forth in that Schedule, be exempt from ordinary Customs duties in excess of those set forth and provided for therein. Such products shall also be exempt from all other duties or charges of any kind imposed on or in connection with importation in excess of those imposed on the date of this Agreement or those directly and mandatorily required to be imposed thereafter by legislation in force in the importing territory on that date.