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Let L, L2, L3 be three Turing-recognizable the following conditions: languages over an alphabet such that they satisfy L UL UL3 = * L

Let L, L2, L3 be three Turing-recognizable the following conditions: languages over an alphabet such that they satisfy L UL UL3 = * L L = 0, L L3 = 0, and L 3 = 0 Prove that L is Turing-decidable.

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