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Automata theory: (a) Give a regular expression for the following language. L = {strings over the alphabet {a,b} that contain at least two a's} (b)

Automata theory: (a) Give a regular expression for the following language.

L = {strings over the alphabet {a,b} that contain at least two a's} (b) Given the regular expression ((a+bb)* ab* a)*, give a nondeterministic finite acceptor (NFA) that accepts its language.

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