CS381hw7 - CS381 Homework Assignment Number 7 due Friday...

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CS381 Homework Assignment Number 7, due Friday, Oct. 14, 2005 Please write your name and net id on the upper right corner of each page. 1. Write a context-free grammar for the language { } | i j k a b c either i j or i k = = . 2. Write a cfg for the complement of ( ) { } * | R ww w a b + 3. Write a cfg for the set of all strings with twice as many b’s as a’s. 4. Describe how to construct a cfg that will generate a given regular set.
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