How to define strings for language with ABC alphabet?

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Vladislav2017-09-03 19:29:09

Programming languages

Vladislav, 2017-09-03 19:29:09

For a language with the alphabet ABC, defining all such and only strings in which the first and last characters are different and each character does not repeat more than three times in a row.
1) Syntactic diagram.
2) Backus forms - Naura.
3) Formal grammar.

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