Elimination of Non-Tariff Barriers to Intra-Community Trade 1. At the level of each regional economic community and subject to the provisions of the Treaty, each Member State shall, upon the entry into force of this Treaty, progressively relax and ultimately remove quota restrictions, and all other non-tariff barriers and prohibitions which apply to exports to that State, of goods originating in the other Member States, at the latest, by the end of the third stage and in accordance with paragraph (2) of this Article. Except as otherwise provided or permitted by this Treaty, each Member State shall thereafter refrain from imposing any further restrictions or prohibitions on such goods. 2. Subject to the provisions of this Treaty, each regional economic community shall adopt a programme for the progressive relaxation and ultimate elimination, at the latest by the end of the third stage, of all quota restrictions and prohibitions and all other non-tariff barriers that apply in a Member State, to imports originating in the other Member States; it being understood that each regional economic community may subsequently decide that all quota restrictions, other restrictions and prohibitions be relaxed or removed within a shorter period than that prescribed in this paragraph. 3. The arrangements governing restrictions, prohibitions, quota restrictions, dumping subsidies and discriminatory practices shall be the subject of a Protocol concerning Non-Tariff Trade Barriers. Article 32 Establishment of a Common External Customs Tariff 1. During the third stage, Member States shall, at the level of each regional economic community, agree to the gradual establishment of a common external customs tariff applicable to goods originating from third States and imported into Member States. 2. During the fourth stage, regional economic communities shall, in accordance with a programme drawn up by them, eliminate differences between their respective external customs tariffs. 3. During the fourth stage the Council shall propose to the Assembly the adoption, at Community level, of a common customs and statistical nomenclature for all Member States. Article 33 System of Intra-Community Trade 1. At the end of the third stage, no Member State shall, at the level of each 25