In this final project you examine the SerialNumber class, which is used by the Home Software Company to validate software serial numbers. A valid software serial number is in the form LLLLL-DDDD-LLLL, where L indicates an alphabetic letter and D indicates a numeric digit. For example, WRXTQ-7786-PGVZ is a valid serial number. Notice that a serial number consists of three groups of characters, delimited by hyphens. The class extracts the three groups of characters and validates them.
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