“(2). An official who enters the service of the Communities after leaving the service of a government administration or of a national or international organization or of an undertaking shall have the right, on becoming established with that Community, to pay to it either:
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The actuarial equivalent of retirement pension rights acquired by him in the government administration, national or international organization or undertaking; or
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The sums repaid to him from the pension fund of the government administration, organization or undertaking at the date of his leaving its service.”