Deleting from a 234-Tree
					• To destroy a 2-node – First, attempt to steal from a sibling to make a 3-node (must pass item through parent to ensure order remains valid) – If that doesn’t work then sibling is also a 2-node; combine with sibling to steal an item from the parent to make a 4-node – Note: parent is never a 2- node, so can always steal from parent if necessary
	• Deleting is more complicated than inserting – For delete, we hate 2-nodes – As in BSTs, cannot delete from a nonleaf – Use same BST trick: delete successor/predecessor and recopy its data
			CS409 - Spring 2000					9