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1. The cash benefit referred to in Article 21 shall be payable throughout the duration of the contingencies referred to in paragraph 1 of Article 19, or until the payment of old-age, invalidity or rehabilitation cash benefit. However, in the contingency referred to in sub-paragraph a of paragraph 1 of Article 19, the duration of cash benefit payment in the form laid down in paragraph 1 of Article 21 may be limited either to thirty-nine weeks in a period of twenty-four months or to thirty-nine weeks in each case of unemployment. In the contingency referred to in sub-paragraph b of paragraph 1 of Article 19, the duration of payment of cash benefit may be limited to a prescribed period.
2. Where a Party's legislation provides that the period of payment of the benefit referred to in paragraph 1 of Article 21 shall vary according to the length of the qualifying period, the provisions of the preceding paragraph shall be deemed to be fulfilled if the average, weighted in accordance with the frequency of cases, of the periods prescribed for the payment of benefit is not less than thirty-nine weeks or half the length of the qualifying period.
3. The minimum period allowed under paragraphs 1 and 2 of this article for the payment of benefit shall be extended, under prescribed conditions, up to the age specified in paragraph 2 of Article 26, in the case of unemployed persons who, when the contingency arises, have attained a prescribed age that is less than the age stipulated in the aforesaid paragraph.
4. Any Party which has accepted the obligations deriving from Part V or Part IX shall be deemed to comply with the provisions of the foregoing paragraph if the said unemployed persons are entitled, from the prescribed age referred to in that paragraph, to an old-age pension or an invalidity pension in accordance with the provisions of Part V or Part IX.
5. In the case of seasonal workers, the period of payment of benefit may be adapted to the conditions of their occupational activity.