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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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Dynabee

... of the groove, while the other end of the axis pushes against the lower rim of the groove. While the axis is slipping around inside the groove, the friction between the axis ...