With regard to the tariff headings in List A, the duties shown in that list shall, for the  purpose of calculating the arithmetical average, be substituted for the duties applied.

3.The duties in the Common Customs Tariff shall not exceed:  

a. 3% for products within the tariff headings in List B;  
b. 10% for products within the tariff headings in List C;  
c. 15% for products within the tariff headings in List D;  
d. 25% for products within the tariff headings in List E; where in respect of such  products, the tariff of the Benelux countries contains a duty not exceeding 3%,  such duty shall, for the purpose of calculating the arithmetical average, be  raised to 12%.

4. List F prescribes the duties applicable to the products listed therein.

5. The lists of tariff headings referred to in this Article and in Article 20 are set out  in Annex I to this Treaty.

Article 20

The duties applicable to the products in list G shall be determined by negotiation  between the Member States. Each Member State may add further products to this list  to a value not exceeding 2% of the total value of its imports from third countries in  the course of the year 1956.

The Commission shall take all appropriate steps to ensure that such negotiations  shall be undertaken before the end of the second year after the entry into force of this   Treaty and be concluded before the end of the first stage.

If, for certain products, no agreement can be reached within these periods, the  Council shall, on a proposal from the Commission, acting unanimously until the end  of the second stage and by a qualified majority thereafter, determine the duties in the  Common Customs Tariff.

Article 21

1. Technical difficulties which may arise in applying Articles 19 and 20 shall be  resolved, within two years of the entry into force of this Treaty, by directives issued  by the Council acting by a qualified majority on a proposal from the Commission.

2. Before the end of the first stage, or at latest when the duties are determined, the  Council shall, acting by a qualified majority on a proposal from the Commission,  decide on any adjustments required in the interests of the internal consistency of the  Common Customs Tariff as a result of applying the rules set out in Articles 19 and  20, taking account in particular of the degree of processing undergone by the various  goods to which the common tariff applies.

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