Question: Let Y ={w| w=t 1 #t 2 # #t k for k 0, each ti 1 * , and ti

Let Y ={w| w=t1#t2# · · · #tk for k ≥ 0, each ti ∈ 1*, and ti ≠ tj whenever i ≠ j}.

Here Σ = {1, #}. Prove that Y is not context free.

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