Question: Show that a 2-stack PDA (a regular PDA with a second stack), unlike its regular PDA counterpart, recognizes the language {ww | w {a,b}*}. Now

Show that a 2-stack PDA (a regular PDA with a second stack), unlike its regular PDA counterpart, recognizes the language {ww | w {a,b}*}. Now show that a 2-stack PDA is as powerful as a Turing Machine, able to simulate each of a Turing Machines moves.

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