Question: Please answer the two standard ML questions Exercise 9 Write a function appendall of type 'a list tree - 'a list that takes a tree

Please answer the two standard ML questions

Exercise 9 Write a function appendall of type 'a list tree - 'a list that takes a tree of lists and returns the result of appending all the lists together. Put the list for a node together in this order: first the contents of the left subtree, then the list at this node, and then the contents of the right subtree. Here again is the definition of tree, as seen earlier in this chapter

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