Paragraph 3
Where the relevant event is the discontinuance of payment under regulation C5(5), the employee is entitled to reckon as reckonable service an additional period of—
where—
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A is the length of the period during which additional contributions have been paid;
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B is the length of the additional period in respect of which the election was made; and
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C is the length of the period during which, under regulation C5(3), the additional contributions were to have been paid,
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each period being expressed in complete years and any fraction of a year.