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@@ -325,6 +325,22 @@ traversal][traversal] that performs the following steps for each node _N_:
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2. **R**: traverse [_tail_][term-tail]
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3. **N**: visit _N_ itself
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###### Enter
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**Enter** is a step right before other steps performed on a given node _N_ when
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[**traversing**][traversal] a tree.
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For example, when performing _preorder_ traversal, **enter** is the first step
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taken, right before visiting _N_ itself.
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###### Exit
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**Exit** is a step right after other steps performed on a given node _N_ when
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[**traversing**][traversal] a tree.
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For example, when performing _preorder_ traversal, **exit** is the last step
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taken, right after traversing the [_tail_][term-tail] of _N_.
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## Tree traversal
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**Tree traversal** is a common task when working with a [_tree_][term-tree] to
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