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Language/Type: C++ binary trees tree traversals
Author: Marty Stepp (on 2016/06/16)

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

     /  \
   47    63
  /  \     \
23    -2    94
     /        \
   55          28

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