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In computer science, group coded recording or group code recording (GCR) refers to several distinct but related encoding methods for representing data on magnetic media. The first, used in 6250 bpi magnetic tape since 1973, is an error-correcting code combined with a run-length limited (RLL) encoding scheme, belonging into the group of modulation codes.
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Varna (Bulgarian: Варна, pronounced [ˈvarnɐ]) is the third-largest city in Bulgaria and the largest city and seaside resort on the Bulgarian Black Sea Coast. Situated strategically in the Gulf of Varna, the city has been a major economic, social and cultural centre for almost three millennia. Historically known as Odessos (Ancient Greek: Ὀδησσός), Varna developed from a Thracian seaside settlement to a major seaport on the Black Sea.
Varna is an important centre for business, transportation, education, tourism, entertainment and healthcare.