Where the conditions required by the legislation of a Member State for entitlement to benefits have been satisfied without having to apply Article 45 [consideration of other periods of insurance or of residence] or Article 40(3) [invalidity benefits], the following rules shall apply:
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the competent institution shall calculate the amount of the benefit that would be due:
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on the one hand, only under the provisions of the legislation which it administers;
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on the other hand ...’.
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