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9.5 a^n b^2n example | Pushdown Automata | PDA in Theory of Computation | Automata Theory in Hindi - YouTube
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computer science - Can 2 items be added/taken away from a stack in push down automata at once? - Mathematics Stack Exchange
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7.1 Nondeterministic Pushdown Automata - An Introduction to Formal Languages and Automata, 7th Edition [Book]
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