(1) notwithstanding anything to the contrary in any law, the provisions of Articles 18, 19, 20, 21(a), Article 22 as it applies to Article 21(a), 23(1) and 24 shall have the force of law. (2) Nothing in Article 24(1) of the Convention shall be construed as (a) entitling the Centre to import into Pakistan goods free of any customs duty without ...