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Starting with an empty stack, these operations are performed: push(9), pop(), push(5), pop(), push(6), pop(), push(2). What is at the top of the stack now?
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Starting with an empty stack, these operations are performed: push(9), pop(), push(5), pop(), push(6), pop(), push(2). What is at the top of the stack now?
Starting with an empty stack, these operations are performed: push(9), push(8), pop(), push(4), pop(), push(4), push(1). What is at the top of the stack now?