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

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