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3. Excess war material mentioned in paragraphs i and 2 of this Article shall be handed over or destroyed within one year from the coming into force of the present Treaty. 4. A definition and list of war material for the purposes of the present Treaty are contained in Annex 111. article 18 Hungary shall cooperate fully with the Allied and Associated Powers with a view to ensuring that Germany may not be able to take steps outside German territory towards rearmament. article 19 Hungary shall not acquire or manufacture civil aircraft which are of German or Japanese design or which embody major assemblies of German or Japanese manufacture or design. article 20 Each of the military and air clauses of the present Treaty shall remain in force until modified in whole or in part by agreement between the Allied and* Associated Powers and Hungary or, after Hungary becomes a member of the United Nations, by agreement between the Security Council and Hungary. SECTION II ARTICLE 21 1. Hungarian prisoners of war shall be repatriated as soon as possible, in accordance with arrangements agreed upon by the individual Powers detaining them and Hungary. 2. All costs, including maintenance costs, incurred in moving Hungarian prisoners of war from their respective assembly points, as chosen by the Government of the Allied or Associated Power concerned, to the point of their entry into Hungarian territory, shall be borne by the Hungarian Government. PART IV. WITHDRAWAL OF ALLIED FORCES ARTICLE 22 i. Upon the coming into force of the present Treaty, all Allied forces shall, within a period of 90 days, be withdrawn from Hungary, subject to the right of the Soviet Union to keep on Hungarian territory such armed forces as it may need for the maintenance of the lines of communication of the Soviet Army with the Soviet zone of occupation in Austria. 2. All unused Hungarian currency and all Hungarian goods in possession of the Allied forces in Hungary, acquired pursuant to Article 11 of the Armistice Agreement, shall be returned to the Hungarian Government within the same period of 90 days. 3. Hungary shall, however, make available such maintenance and facilities as may specifically be required for the maintenance of the lines of communication with the Soviet zone of occupation in Austria, for which due compensation will be made to the Hungarian Government.