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Where depreciable property, other than a timber resource property, of a taxpayer has, in a taxation year, been disposed of to a person with whom the taxpayer was dealing at arm’s length, and the proceeds of disposition include an agreement for the sale of, or a mortgage or hypothecary claim on, land that the taxpayer has, in a subsequent taxation year, sold to a person with whom the taxpayer was dealing at arm’s length, there may be deducted in computing the income of the taxpayer for the subsequent year an amount equal to the lesser of