Question: Let the alphabet C be { a , b , c } . Let the language X be the set of all strings over C

Let the alphabet C be {a, b, c}. Let the language X be the set of all strings over C with at
least two occurrences of b. Let Y be the language of all strings over C that never have two
occurrences of c in a row. Let Z be the language of all strings over C in which every c is
followed by an a.(Recall that any string with no cs is thus in Z.)

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