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a drilling or exploration expense, including any general geological or geophysical expense, incurred by the taxpayer on or in respect of exploring or drilling for petroleum or natural gas in that country,
a drilling or exploration expense, including any general geological or geophysical expense, incurred by the taxpayer on or in respect of exploring or drilling for petroleum or natural gas in that country,
a drilling or exploration expense, including any general geological or geophysical expense, incurred by the taxpayer on or in respect of exploring or drilling for petroleum or natural gas in that country,