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L2 is halting problem.
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L1 and L2 both undecidable
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L1 is the emptiness problem of TM which is undecidable

L2 is halting problem and we know that halting problems are undecidable

NOTE: Emptiness problem is decidable only for Regular languages, CFL and DCFL

            but for CSL, REC and RE, it is undecidable.

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