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Texts of proposed amendments to the Convention shall be communicated by the Secretary-General to Members at least six months in advance of their consideration by the Assembly. Amendments shall be adopted by a two-thirds majority vote of the Assembly. Twelve months after its acceptance by two thirds of the Members of the Organization, other than Associate Members, each amendment shall come into force for all Members. If within the first 60 days of this period of twelve months a Member gives notification of withdrawal from the Organization on account of an amendment the withdrawal shall, notwithstanding the provisions of Article 58 of the Convention, take effect on the date on which such amendment comes into force.