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Reference to the parent node in the tree.
Source position: avl_tree.pp line 45
| public TAVLTreeNode.Parent : TAVLTreeNode; | 
Parent contains a reference to the parent node of the current node. It is Nil for the root node.
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 | Reference to the left subtree of the current node. | |
| 
 | Reference to the right subtree of the current node. |