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The stipulations of this Convention extend to letters, post-cards, printed matter of all kinds, commercial documents and samples of merchandise, originating in one of the countries of the Union and intended for another of those countries. They also apply, so far as regards conveyance within the Union, to the exchange by mail of the articles above mentioned between the countries of the Union and countries foreign to the Union, whenever that exchange makes use of the services of two of the contracting parties at least.