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semimanufacturas y manufacturas de plástico, excepto las pertenecientes a las partidas ex 3916, ex 3917, ex 3920 y ex 3921, cuyas normas se indican más adelante:
semi-manufactures and articles of plastics; except for headings ex 3916, ex 3917, ex 3920 and ex 3921, for which the rules are set out below: