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Alphabet And Strings

An alphabet is a finite non-empty set of symbols. It is denoted by a letter Σ.

  • Σ = {0, 1} is a binary alphabet.
  • Σ = {A, B, ........, Z; a, b, c, ........., z} is an english alphabet.

A string over an alphabet Σ is a sequence of any number of symbols from Σ.

  • 0, 1, 11, 00 and 011 are strings over {0, 1}.

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