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an oil or gas well in that country or real or immovable property in that country the principal value of which depends on its petroleum or natural gas content (but not including depreciable property),
an oil or gas well in that country or real or immovable property in that country the principal value of which depends on its petroleum or natural gas content (but not including depreciable property),
an oil or gas well in that country or real or immovable property in that country the principal value of which depends on its petroleum or natural gas content (but not including depreciable property),
an oil or gas well in that country or real property in that country the principal value of which depends on its petroleum or natural gas content (but not including depreciable property),