Mbé vs Łódź

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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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The Vietnamese alphabet (Vietnamese chu Quoc Ngu, script for the national language) uses the modern Latin writing script. It uses the Latin script that was originally created by Francisco de Pina, a Portuguese missionary. The Vietnamese alphabet has 29 letters. Five additional diacritics are used to indicate tone (as in a), a), a), a and a.

Complex vowels and numerous letters with diacritics can stack twice on one letter, such as e.g. The complex vowel system and the large number of letters with diacritics, which can even stack twice on the same letter (e.g. Diacritics are used to produce a precise sound transcription of tonal languages.

Source: Wikipedia