>>> stack = list() >>> stack.extend([5,2,3,4,5]) >>> stack.append(8) >>> stack [5, 2, 3, 4, 5, 8] >>> stack.pop() 8 >>> stack.pop() 5 >>> stack [5, 2, 3, 4] >>> len(stack) 4
>>> stack = list() >>> stack.extend([5,2,3,4,5]) >>> stack.append(8) >>> stack [5, 2, 3, 4, 5, 8] >>> stack.pop() 8 >>> stack.pop() 5 >>> stack [5, 2, 3, 4] >>> len(stack) 4
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