Paragraph 4
A person who discontinues payment under regulation C7(20) shall be entitled to reckon under regulation D13 as whole-time reckonable service an additional period calculated as—
where—
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L is the total amount paid by way of instalments under regulation C7(15);
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M is the total sum payable by him under regulation C7(9); and
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N is the length of the period of whole-time reckonable service which the person would have been entitled to reckon under regulation D13 if payment had been completed.