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the total of such of its Canadian exploration and development expenses as were incurred by it before the end of the taxation year, to the extent that they were not deductible in computing income for a previous taxation year, and
the total of such of its Canadian exploration and development expenses as were incurred by it before the end of the taxation year, to the extent that they were not deductible in computing income for a previous taxation year, and
the total of such of its Canadian exploration and development expenses as were incurred by it before the end of the taxation year, to the extent that they were not deductible in computing income for a previous taxation year, and