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Features of the original document layout such as columns, tables, line and letter spacing, pagination, and margins will not be preserved in the text version. If you need the complete document, download the WordPerfect version or Adobe Acrobat version, if available. Under an LRN architecture, each switch is assigned a unique ten-digit LRN, the first six digits of which identify the location of that switch. Each customer's telephone number is paired with the LRN for the switch that currently serves that telephone number, and the number and the corresponding LRN are stored in one of seven databases, each of which serves an area that corresponds to one of the original Regional Bell Operating Company service territories. Neutral third parties, called local number portability administrators, will administer these regional databases.