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Notwithstanding subsection 13(7) and the definition proceeds of disposition in section 54, where at any particular time in a taxation year a taxpayer disposes of a building of a prescribed class and the proceeds of disposition of the building determined without reference to this subsection and subsection 13(21.2) are less than the lesser of the cost amount and the capital cost to the taxpayer of the building immediately before the disposition, for the purposes of paragraph (a) of the description of F in the definition undepreciated capital cost in subsection 13(21) and Subdivision C,