def mlr_f(self,root):
stack=[]
if root is not None:
stack.append(root)
while len(stack)!=0:
result1.append(stack.pop().val)
if root.right is not None:
stack.append(root.right)
if root.left is not None:
stack.append(root.left)
stack=[]
if root is not None:
stack.append(root)
while len(stack)!=0:
result1.append(stack.pop().val)
if root.right is not None:
stack.append(root.right)
if root.left is not None:
stack.append(root.left)
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