8. (10 pts) Let A. B. and C be languages. Prove or disprove: If A Sm. B and A Sm C, then A Sm BC. Justify your answer.
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8. (10 pts) Let A. B. and C be languages. Prove or disprove: If A Sm. B and A Sm C, then A Sm BC. Justify your answer.
8. (10 pts) Let A. B. and C be languages. Prove or disprove: If A Sm. B and A Sm C, then A Sm BC. Justify your answer.
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