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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