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ARTICLE 24 Any dispute relating to the interpretation or execution of the present Instrument, not resolved by direct negotiations, shall, unless the parties mutually agree upon another means of settlement, be referred at the request of either party to the dispute to a Commission composed of one representative of each party and a third member selected by mutual agreement of the two parties from nationals of a third country. Should the two parties fail to agree within a period of one month upon the appointment of the third member, the of the United Nations may be requested by either party to make the appointment. The decision of the majority of the members of the Commission shall be the decision of the Commission, and shall be accepted by the parties as definitive and binding. article 25 Proposals for amendment to the present Instrument may be submitted to the Security Council by the Council of Government of the Free Territory or by three or more States represented on the International Commission. An amendment approved by the Security Council shall enter into force on the date determined by the Security Council. article 26 For the purposes of the present Instrument a State shall be considered as having assumed the obligations of this Instrument if it is a party to the Treaty of Peace with Italy or has notified the Government of the French Republic of its assumption of such obligations. ANNEX IX. TECHNICAL DISPOSITIONS REGARDING THE FREE TERRITORY OF TRIESTE (See Article 21) A. Water Supply to Northwestern Istria Yugoslavia shall continue to supply water to the region of northwestern Istria within the Free Territory of Trieste from the spring of San Giovanni de Pinguente through the Quieto water supply system and from the spring of Santa Maria del Risano through the Risano system. The water so supplied shall be in such amounts, not substantially exceeding those amounts which have been customarily supplied to the region, and at such rates of flow, as the Free Territory may request, but within limits imposed by natural conditions. Yugoslavia shall maintain the water conduits, reservoirs, pumps, purifying systems and such other works within Yugoslav territory as may be required to fulfil this obligation. Temporary allowance must be made in respect of the foregoing obligations on Yugoslavia for necessary repair of war damage to water supply installations. The Free Territory shall pay a reasonable price for the water thus supplied, which price should represent a proportionate share, based on the quantity of water consumed within the Free Territory, of the total cost of operation and maintenance of the Quieto and the Risano water supply systems. Should, in the future, additional supplies of water be required by the Free Territory, Yugoslavia undertakes to examine the matter jointly with the authorities of the Free Territory and by agreement to take such measures as are reasonable to meet these requirements. . B. Electricity Supplies 1. Yugoslavia and Italy shall maintain the existing supply of electricity to the Free Territory of Trieste, furnishing to the Free Territory such quantities of electricity at such rates of output as the latter may require. The quantities furnished need not at first substantially exceed those which have