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1. Write regular expressions for the following sets: (a) All strings whose number of o's is divisible by three. (b) All strings with no more
1. Write regular expressions for the following sets: (a) All strings whose number of o's is divisible by three. (b) All strings with no more than three 0's. (c) All strings with exactly one occurrence of the substring 111. 2. Give an NFA that accepts the set of strings that contain an even number of substrings 01
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