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any expense (other than an expense incurred in drilling or completing an oil or gas well or in building a temporary access road to, or preparing a site in respect of, any such well) incurred by the taxpayer after March, 1985 for the purpose of bringing a natural accumulation of petroleum or natural gas (other than a mineral resource) in Canada into production and incurred prior to the commencement of the production (other than the production from an oil or gas well) in reasonable commercial quantities from such accumulation, including