Q3. Build a multi-stack Push Down Automata (PDA) (it means you can use more than one stack, for example 3 stacks) to accept the language {a"b"a"b" | n21} over the alphabet E={a,b}. Please explain your...

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Extracted text: Q3. Build a multi-stack Push Down Automata (PDA) (it means you can use more than one stack, for example 3 stacks) to accept the language {a"b"a"b" | n21} over the alphabet E={a,b}. Please explain your design shortly and draw the PDA.