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in the case of such portion of any non-capital loss, restricted farm loss, farm loss or limited partnership loss of the subsidiary as may reasonably be regarded as its loss from carrying on the subsidiary’s loss business, be deemed, for the taxation year of the parent in which the subsidiary’s loss year ended, to be a non-capital loss, restricted farm loss, farm loss or limited partnership loss, respectively, of the parent from carrying on the subsidiary’s loss business, that was not deductible by the parent in computing its taxable income for any taxation year that commenced before the commencement of the winding-up,