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Reserved word

A reserved word is a word which, in some computer language, cannot be used as an identifier because it is already used for some grammatical purpose. For instance, in SQL, a user cannot be called 'group' because the word 'group' is used to indicate that an identifier refers to a group, not a user.

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Sakhalin

... possession of its southern part (1905-1945). Sakhalin is separated from the mainland by the narrow and shallow Strait of Tartary or Mamiya Strait, which often freezes ...