Regulation (EEC) No 1256/75 of the Commission of 14 May 1975 re-establishing the levying of the customs duties on flax or ramie yarn, not put up for retail sale, falling within heading No 54.03, originating in Brazil, to which the preferential tariff arrangements set out in Council Regulation (EEC) No 3048/74 of 2 December 1974 apply