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In order to indicate the progress which has been made in all matters relating to the simplification of the Customs and other similar formalities referred to in the preceding Articles, each of the Contracting States shall, within twelve months from the coming into force in its own case of the present Convention, furnish the Secretary-General of the League of Nations with a summary of all the steps which it has taken to effect such simplification.
Similar summaries shall thereafter be furnished every three years and whenever requested by the Council of the League.