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the amount determined by the formula($3,500 × Y) - Z where Y is the number of calendar years before 1990 each of which is a year all or any part of which is included in the individual’s eligible service under a registered pension plan to which the individual has made a contribution that is included in the total determined under clause 147.2(4)(b)(i)(A) and in which the individual was not a contributor to any registered pension plan, or all or any part of which is included in the individual’s eligible service under a registered pension plan to which the individual has made a contribution that is included in the total determined under clause 147.2(4)(b)(i)(A), and that the individual made before March 28, 1988 or was obliged to make under the terms of an agreement in writing entered into before March 28, 1988, and in which the individual was not a contributor to the plan, and Z is the total of all amounts each of which is an amount deducted, in computing the individual’s income for a preceding taxation year, in respect of contributions included in the total determined in respect of the individual for the year under clause 147.2(4)(b)(i)(A), or where the preceding year was before 1987, under subparagraph 8(1)(m)(ii) (as it read in its application to that preceding year) in respect of additional voluntary contributions made in respect of a year that satisfies the conditions in the description of Y, and