[Solved] Theory of Computing L1 is unknown L2 is r

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Theory of Computing L1 is unknown L2 is regular L1L2 is regular. Thus I think L1 is regular. -- What is wrong with my reasoning?

Theory of Computing

L1 is unknown

L2 is regular

L1L2 is regular.

Thus I think L1 is regular.

-- What is wrong with my reasoning?

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