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There may be deducted in computing the tax payable under this Part for a taxation year by a corporation (other than a corporation that was throughout the year a financial institution, within the meaning assigned by section 190) an amount equal to such part as the corporation claims of its unused Part I.3 tax credits for any of its 7 immediately preceding taxation years ending before 1992, to the extent that that amount does not exceed the amount, if any, by which