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Explanation: Perforaciones diamantinas (diamond drilling) is a type of drilling where a cylindrical solid sample, the core, is cut by the diamond bit. The right word to use is core, sample is too general. continuous means that the core is cut without interruptions, but those imposed by the core barrel length, that when is full the drilling is interrupted and the core is taken to the surface, where the core barrel is emptied and lowered again into the hole to go on with drilling.