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An amount deducted under subsection (4) or (4.1) in computing the income of a taxpayer for a particular taxation year from a farming business carried on in a region prescribed under those subsections may, to the extent that the taxpayer so elects, be included in computing the taxpayer’s income from the business for a taxation year ending after the particular taxation year, and is, except to the extent that the amount has been included under this subsection in computing the taxpayer’s income from the business for a preceding taxation year after the particular year, deemed to be income of the taxpayer from the business for the taxation year of the taxpayer that is the earliest of