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CNAP, which stands for Call Number Allocation Plan, is a crucial aspect of the Global System for Mobile Communications (GSM). It is a numbering plan used by mobile networks to allocate unique numbers to subscribers. The in CNAP 711 is a URL encoding mechanism, replacing the space character in the original phrase CNAP 711. In URLs, spaces are not allowed, and thus, they are replaced with for proper interpretation by web browsers and servers.

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The drilling process itself involves a technique known as 'circulation.' A drilling fluid, commonly referred to as 'mud,' is continuously pumped down the drill string, through the bit, and back up the annulus between the drill string and the walls of the hole. This fluid serves multiple purposes it cools and lubricates the bit, carries cuttings to the surface, stabilizes the borehole, and provides hydrostatic pressure to prevent underground fluids from entering.

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