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Give a formal definition with any notations for each of the following: Alpha - bet, String, Language, Concatenation of strings, Reverse of a string, Substring,

Give a formal definition with any notations for each of the following: Alpha

-

bet, String, Language, Concatenation of strings, Reverse of a string, Substring,

Length of a string, Star

-

Closure of an alphabet, Positive Closure of an alphabet,

Sentence of a language.

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