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Question
Consider the following languages. L1 = {0p 1q 0r | p, q, r ≥ 0} L2 = {0p 1q 0r | p, q, r ≥ 0, p ≠ r} Which one of the following statements is FALSE?
Options:
A .  L2 is context-free.
B .  L1 ∩ L2 is context-free.
C .  Complement of L2 is recursive.
D .  Complement of L1 is context-free but not regular.
Answer: Option D


-NA-



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