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Vietnamese uses 22 letters of the ISO basic Latin alphabet.The 4 remaining letters aren't considered part of the Vietnamese alphabet although they are used to write loanwords, languages of other ethnic groups in the country based on Vietnamese phonetics to differentiate the meanings or even Vietnamese dialects, for example: dz or z for southerner pronunciation of v in standard Vietnamese.
In mathematics, especially in the area of algebra known as group theory, the term Z-group refers to a number of distinct types of groups: in the study of finite groups, a Z-group is a finite group whose Sylow subgroups are all cyclic. in the study of infinite groups, a Z-group is a group which possesses a very general form of central series.
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