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6. Prove or disprove each of the following statements where ri, r2, r3 are regular expressions. (a) (r) = ri (b) ri(r Ur2)* = (r1

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6. Prove or disprove each of the following statements where ri, r2, r3 are regular expressions. (a) (r*)* = ri (b) ri(r Ur2)* = (r1 U r2)* (c) (rir2)* = rire (d) ri(rr*)* = (rir*)*r

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