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Prove that a 3PDA is not more powerful than a 2PDA. Hint: The Turing machine is the most powerful machine possible. If you can simulate

Prove that a 3PDA is not more powerful than a 2PDA.

Hint: The Turing machine is the most powerful machine possible. If you can simulate a Turing machine using a 2PDA, then a 2PDA is as powerful as a Turing machine. How can you simulate a Turing machine using a 2PDA while it is impossible to simulate a Turing machine with a PDA?

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