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the amount so applied does not exceed such portion of the total of the debtor’s foreign exploration and development expenses (within the meaning assigned by subsection 66(15)) as were incurred by the debtor before that time and would be deductible under subsection 66(4) in computing the debtor’s income for that year if the debtor had sufficient income described in subparagraph 66(4)(b)(ii) and if that year ended at that time; and