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traversal3

Language/Type: C++ binary trees tree traversals

Write the elements of the tree below in the order they would be seen by a pre-order, in-order, and post-order traversal.

    2
     \
      1
     / \
    7   6
   /     \
  4       9
 / \     /
3   5   8
pre-order
in-order
post-order

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