Question: = (15 pt) For every two languages L1, L2 C I* and the reverse of a language L be defined as IR {W I* |

= (15 pt) For every two languages L1, L2 C I* and the reverse of a language L be defined as IR {W I* | w = xR for some x L}. Then, prove that (L1L2)R = LLR
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