diff --git a/src/data-structures/binary-tree/avl-tree-multi-map.ts b/src/data-structures/binary-tree/avl-tree-multi-map.ts
index 07bec46..ce63d90 100644
--- a/src/data-structures/binary-tree/avl-tree-multi-map.ts
+++ b/src/data-structures/binary-tree/avl-tree-multi-map.ts
@@ -83,6 +83,10 @@ export class AVLTreeMultiMap<
    * @returns the sum of the count property of all nodes in the tree.
    */
   get count(): number {
+    return this._count;
+  }
+
+  getMutableCount(): number {
     let sum = 0;
     this.dfs(node => (sum += node.count));
     return sum;
@@ -414,7 +418,7 @@ export class AVLTreeMultiMap<
    * @returns The method is returning the result of calling the `_replaceNode` method from the
    * superclass, after updating the `count` property of the `newNode` object.
    */
-  protected _replaceNode(oldNode: NODE, newNode: NODE): NODE {
+  protected override _replaceNode(oldNode: NODE, newNode: NODE): NODE {
     newNode.count = oldNode.count + newNode.count;
     return super._replaceNode(oldNode, newNode);
   }
diff --git a/src/data-structures/binary-tree/avl-tree.ts b/src/data-structures/binary-tree/avl-tree.ts
index 2737cd3..b8e5074 100644
--- a/src/data-structures/binary-tree/avl-tree.ts
+++ b/src/data-structures/binary-tree/avl-tree.ts
@@ -522,7 +522,7 @@ export class AVLTree<
    * @returns the result of calling the `_replaceNode` method on the superclass, passing in the
    * `oldNode` and `newNode` as arguments.
    */
-  protected _replaceNode(oldNode: NODE, newNode: NODE): NODE {
+  protected override _replaceNode(oldNode: NODE, newNode: NODE): NODE {
     newNode.height = oldNode.height;
 
     return super._replaceNode(oldNode, newNode);
diff --git a/src/data-structures/binary-tree/binary-tree.ts b/src/data-structures/binary-tree/binary-tree.ts
index 54441ef..f6fa66b 100644
--- a/src/data-structures/binary-tree/binary-tree.ts
+++ b/src/data-structures/binary-tree/binary-tree.ts
@@ -1837,7 +1837,7 @@ export class BinaryTree<
    * following types:
    * @param {BinaryTreePrintOptions} [options={ isShowUndefined: false, isShowNull: false, isShowRedBlackNIL: false}] - Options object that controls printing behavior. You can specify whether to display undefined, null, or sentinel nodes.
    */
-  print(beginRoot: KeyOrNodeOrEntry<K, V, NODE> = this.root, options?: BinaryTreePrintOptions): void {
+  override print(beginRoot: KeyOrNodeOrEntry<K, V, NODE> = this.root, options?: BinaryTreePrintOptions): void {
     const opts = { isShowUndefined: false, isShowNull: false, isShowRedBlackNIL: false, ...options };
     beginRoot = this.ensureNode(beginRoot);
     if (!beginRoot) return;
diff --git a/src/data-structures/binary-tree/bst.ts b/src/data-structures/binary-tree/bst.ts
index d8366f1..73448b2 100644
--- a/src/data-structures/binary-tree/bst.ts
+++ b/src/data-structures/binary-tree/bst.ts
@@ -856,7 +856,7 @@ export class BST<
    * @param {NODE | undefined} v - The parameter `v` is of type `NODE | undefined`. This means that it
    * can either be an object of type `NODE` or it can be `undefined`.
    */
-  protected _setRoot(v: NODE | undefined) {
+  protected override _setRoot(v: NODE | undefined) {
     if (v) {
       v.parent = undefined;
     }
diff --git a/src/data-structures/binary-tree/rb-tree.ts b/src/data-structures/binary-tree/rb-tree.ts
index bfb958f..479193a 100644
--- a/src/data-structures/binary-tree/rb-tree.ts
+++ b/src/data-structures/binary-tree/rb-tree.ts
@@ -89,26 +89,16 @@ export class RedBlackTree<
     return this._SENTINEL;
   }
 
-  protected _root: NODE | undefined;
+  protected override _root: NODE | undefined;
 
   /**
    * The function returns the root node of a tree or undefined if there is no root.
    * @returns The root node of the tree structure, or undefined if there is no root node.
    */
-  get root(): NODE | undefined {
+  override get root(): NODE | undefined {
     return this._root;
   }
 
-  protected _size: number = 0;
-
-  /**
-   * The function returns the size of an object.
-   * @returns The size of the object, which is a number.
-   */
-  get size(): number {
-    return this._size;
-  }
-
   /**
    * The function creates a new Red-Black Tree node with the specified key, value, and color.
    * @param {K} key - The key parameter represents the key of the node being created. It is of type K,
@@ -262,8 +252,8 @@ export class RedBlackTree<
    * size counter to zero.
    */
   override clear() {
+    super.clear();
     this._root = this.SENTINEL;
-    this._size = 0;
   }
 
   /**
diff --git a/src/types/common.ts b/src/types/common.ts
index 79a4e90..fce4da0 100644
--- a/src/types/common.ts
+++ b/src/types/common.ts
@@ -69,4 +69,4 @@ export enum CRUD {
   READ = 'READ',
   UPDATED = 'UPDATED',
   DELETED = 'DELETED'
-}
\ No newline at end of file
+}
diff --git a/test/unit/data-structures/binary-tree/avl-tree-multi-map.test.ts b/test/unit/data-structures/binary-tree/avl-tree-multi-map.test.ts
index d49a28b..ec3165f 100644
--- a/test/unit/data-structures/binary-tree/avl-tree-multi-map.test.ts
+++ b/test/unit/data-structures/binary-tree/avl-tree-multi-map.test.ts
@@ -35,8 +35,11 @@ describe('AVLTreeMultiMap count', () => {
       [2, 2],
       [3, 3]
     ]);
+    tm.add([2, 2], undefined, 10)
     tm.lesserOrGreaterTraverse(node => (node.count += 2), CP.gt, 1);
-    expect(tm.count).toBe(7);
+    tm.delete(2);
+    expect(tm.count).toBe(12);
+    expect(tm.getMutableCount()).toBe(16);
   });
 });