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BJP5 Self-Check 17.4: traversal1

Language/Type: Java binary trees tree traversals
Author: Robert Baxter (on 2019/09/19)

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

          +---+
          | 3 |
          +---+
         /     \
     +---+     +---+
     | 5 |     | 2 |
     +---+     +---+
    /         /     \
+---+     +---+     +---+
| 1 |     | 4 |     | 6 |
+---+     +---+     +---+
pre-order
in-order
post-order

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