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Merge 2 Binary Trees:

def merge(t1, t2):

if not t1 and not t2:

return None

elif not t1:

return t2

elif not t2:

return t1

else:

node = Node(t1.data + t2.data)

node.left = merge(t1.left, t2.left)

node.right = merge(t1.right, t2.right)

return node

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