Representations of Trees 
Many different representations of trees are possible:
-  Binary tree: contents and left and right links.
 
-  First-child/next-sibling: contents, first-child, next sibling.
 
-  Linked list: the first element contains the contents,
the rest are a linked list of children.
 
-  Implicit: a node may contain only the contents; the children
can be generated from the contents or from the location of the parent.
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