Mbé vs Lutsk

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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.

The others are different mainframe hard disk as well as floppy disk encoding methods used in some microcomputers until the late 1980s. GCR is a modified form of a NRZI code, but necessarily with a higher transition density.

Source: Wikipedia

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Lutsk (Ukrainian: Луцьк, romanized: Luts'k, IPA: [lutsʲk]; Polish: Łuck [wutsk]; Yiddish: לוצק‎, romanized: Lutzk) is a city on the Styr River in northwestern Ukraine. It is the administrative center of the Volyn Oblast (province) and the administrative center of the surrounding Lutsk Raion (district) within the oblast, though it is not a part of the raion.

Lutsk has the status of a city of oblast significance, equivalent to that of a raion. Population: 217,103 (2015 est.)

Source: Wikipedia