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what are the regular expressions that describe each of the following languages, which are over the alphabet {0, 1}. a-) w contains substring 00 at

what are the regular expressions that describe each of the following languages, which are over the alphabet {0, 1}.

a-) w contains substring 00 at most once, and substring 11 at most once

b-) w does not contain substring 001, and w contains an even number of 1s

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