<data> Processing nodes in a graph one at a time, usually in some
specified order. Traversal of a tree is recursively defined to mean visiting the
root node and traversing its children. Visiting a node usually involves
transforming it in some way or collecting data from it.
In "pre-order traversal", a node is visited _before_ its children. In
"post-order" traversal, a node is visited _after_ its children. The more rarely
used "in-order" traversal is generally applicable only to binary trees, and is
where you visit first a node's left child, then the node itself, and then its
For the binary tree:
A pre-order traversal visits the nodes in the order T I D E S. A
post-order traversal visits them in the order D E I
S T. An in-order traversal visits them in the order
D I E T S.
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