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Any Contracting State may conclude with one or more Contracting States agreements, which contain provisions on matters governed by the Convention, with a view to improving the application of the Convention between or among themselves, provided that such agreements are consistent with the objects and purpose of the Convention and do not affect, in the relationship of such States with other Contracting States, the application of the provisions of the Convention. The States which have concluded such an agreement shall transmit a copy to the depositary of the Convention.