I am having trouble choosing the string to use for the proof. I know that I have to choose a string such that at least two substrings separated by the # are equal to each other but am unsure of how to approach this. If someone could please help me with this, I would appreciate it.
2026-03-25 07:45:37.1774424737
How to prove that the language L={w1#w2#. . .#wk: k ≥ 2, each wi ∈ {0,1}^* , and wi = wj for some i !=j} is not context free using the pumping lemma?
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HINT: If $p$ is the pumping length, try $w=0^p1^p\#0^p1^p$.