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stack = [3, 4, 5]
stack.append(6)
stack.append(7)
stack
[3, 4, 5, 6, 7]
stack.pop()
7
stack
[3, 4, 5, 6]
stack.pop()
6
stack.pop()
[3, 4]
stack = [3, 4, 5]
stack.append(6)
stack.append(7)
stack
[3, 4, 5, 6, 7]
stack.pop()
7
stack
[3, 4, 5, 6]
stack.pop()
6
stack.pop()
[3, 4]