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Let sigma = {b, c}. Which of the following are valid regular expressions? (bc+c)(cbc+bb) cbbc + Lambda bc(b + cb^+) bca*cc cb^n cc, n greaterthanorequalto

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Let sigma = {b, c}. Which of the following are valid regular expressions? (bc+c)(cb*c+bb) c*bbc + Lambda bc(b + cb^+) bca*cc cb^n cc, n greaterthanorequalto 0 (cb + b*c)*

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