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any portion of a net capital loss of the subsidiary that would otherwise be deemed by this subsection to be a loss of the parent for a particular taxation year beginning after the commencement of the winding-up shall be deemed, for the purposes of computing its taxable income for taxation years beginning after the commencement of the winding-up, to be a net capital loss of the parent for its immediately preceding taxation year and not for the particular year, where the parent so elects in its return of income under this Part for the particular year.