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keys(+Tree, -KeyList)
Return all the keys from a tree.
- Tree
- A 2-3-4 tree
- KeyList
- A list of all the keys from Tree
Description
	
	KeyList is a list of all the keys appearing in the tree Tree.
	
	
	This predicate should only be called with trees created by other
	predicates from the tree234 module.
	
	
Fail Conditions
Never fails.
Resatisfiable
no
See Also
values / 2