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# Primitive

A primitive is a word that is defined by the system. For example, `+` is a primitive. The meaning of a primitive is fixed and cannot be changed.

A primitive is spelled with a graphic character (such as `+`) or with a graphic modified by an inflection (a dot or colon), as in `+.` or `+:` .

A primitive is also spelled by one or more letters followed by a dot or colon. For example, `i.` is a primitive that is called index or index of depending on how it is used.

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