Question: Please prove both ways Problem 50. Prove: A language A C 10, 1)* is co-c.e. if and only if there is a decidable language B

Please prove both ways
Problem 50. Prove: A language A C 10, 1)* is co-c.e. if and only if there is a decidable language B C 10,1 such that, for all e 10,1 Problem 50. Prove: A language A C 10, 1)* is co-c.e. if and only if there is a decidable language B C 10,1 such that, for all e 10,1
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