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avlbinstree

AVL self-balancing binary search trees for ES6

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Avlbinstree

AVL self-balancing binary search trees for ES6

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Description

ES6 implementation of the AVL self-balancing binary search tree data structure with TypeScript support.

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Visit the contributing guidelines to learn more on how to translate this document into more languages.

Contents

Install

Yarn

yarn add avlbinstree

NPM

npm install avlbinstree

In Depth

An AVL tree is a self-balancing binary search tree data structure, whose nodes contain a unique key, an associated value, and point to two distinguished left and right sub-trees. In the tree, the heights of the two child sub-trees of any node differ by at most one. If during a mutating operation, e.g insertion, deletion, a temporary height difference of more than one arises between two child sub-trees, the balance property of the parent sub-tree, thus of the entire tree itself, is restored through the internal usage of tree rotations. These repair tools move the tree nodes only vertically, so that the horizontal/in-order sequence of their keys is fully preserved. Lookup, insertion, and deletion all take O(log n) time in both the average and worst cases, where n is the number of nodes in the tree prior to the operation. Insertions and deletions may require the tree to be rebalanced by one or more tree rotations.

Usage

Avlbinstree exposes a chainable API, that can be utilized through a simple and minimal syntax, allowing you to combine methods effectively.

Usage examples can be also found at the test directory.

'use strict';
const {Tree, Node} = require('avlbinstree');

const tree = new Tree();
//=> Tree { root: null }

tree.insert(9, 'A');
// => Tree { root: Node { left: null, right: null, key: 9, value: 'A' } }

tree.root;
//=> Node { left: null, right: null, key: 10, value: 'A' }

const node = new Node(9, 'A');

tree.root.key === node.key;
//=> true

tree.root.value === node.value;
//=> true

tree.insert(5, 'B').insert(13, 'C').root;
//=> Node { left: [Node], right: [Node], key: 9, value: 'A' }

tree.root.left;
//=> Node { left: null, right: null, key: 5, value: 'B' }

tree.root.right;
//=> Node { left: null, right: null, key: 13, value: 'C' }

tree.insert(11, 'D').insert(15, 'E');
/*=>    {9}
 *     /  \
 *   {5}  {13}
 *        /  \
 *     {11}  {15}
 */

tree.size();
//=> 5

tree.search(13);
//=> Node { key: 13, value: 'C',
//  left: Node { left: null, right: null, key: 11, value: 'D' },
//  right: Node { left: null, right: null, key: 15, value: 'E' } }

tree.search(25);
//=> null

tree.includes(11);
//=> true

tree.includes(100);
//=> false

tree.height();
//=> 2

tree.remove(5);
/*=>   {13}
 *     /  \
 *  {9}  {15}
 *    \
 *   {11}
 */

tree.root.isRightHeavy();
//=> false

tree.root.isLeftHeavy();
//=> true

tree.max();
//=> Node { left: null, right: null, key: 15, value: 'E' }

tree.maxKey();
//=> 15

tree.maxValue();
//=> 'E'

tree.min();
//=> Node { left: null, right: null, key: 9, value: 'A' }
  
tree.minKey();
//=> 9

tree.minValue();
//=> 'A'

tree.remove(15);
/*=>   {11}
 *     /  \
 *   {9}  {13}
 */

tree.root.isBalanced();
//=> true

tree.keys();
//=> [9, 11, 13]

tree.values();
//=> ['A', 'D', 'C']

API

tree.root
  • Return Type: Node | null

Returns the root node of the tree. If the tree is empty null is returned.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A');
// => Tree { root: Node { key: 10, value: 'A', left: null, right: null } }
tree.root;
// => Node { key: 10, value: 'A', left: null, right: null }
tree.clear()
  • Return Type: Tree

Mutates the tree by removing all residing nodes and returns it empty.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(5, 'B').insert(15, 'C');
//=> Tree { root: Node { left: [Node], right: [Node], key: 3, value: 'A' } }
tree.size();
//=> 3
tree.clear();
//=> Tree { root: null } }
tree.size();
//=> 0
tree.fullNodes()
  • Return Type: Array<Node>

Applies in-order traversal to the tree and stores each traversed full node (node with two non-null children) in an array. The array is returned at the end of the traversal.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(5, 'B').insert(15, 'C');
tree.fullNodes();
//=> [ 
//  Node { left: [Node], right: [Node], key: 10, value: 'A' } 
// ]
tree.height()
  • Return Type: Number

Returns the maximum distance of any leaf node from the root. If the tree is empty -1 is returned.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A');
tree.height();
// => 0
tree.insert(5, 'B').insert(15, 'C').insert(25, 'D');
tree.height();
//=> 3
tree.includes(key)
  • Return Type: Boolean

Determines whether the tree includes a node with a certain key, returning true or false as appropriate.

key
  • Type: Number

Node key to search for.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(5, 'B');
tree.includes(10);
// => true
tree.includes(25);
// => false
tree.includes(5);
// => true
tree.inOrder(fn)
  • Return Type: Tree

Applies in-order traversal (depth-first traversal - LNR) to the tree and executes the provided fn function on each traversed node without mutating the tree itself.

fn
  • Type: Function

Function to execute on each node.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(5, 'B').insert(15, 'C');
tree.inOrder(node => console.log(node.key));
// => 5
// 10
// 15
tree.insert(key, value)
  • Return Type: Tree

Mutates the tree by inserting a new node at the appropriate location.

key
  • Type: Number

Can be any number that will correspond to the key of the created node. Each node has its own unique key.

value
  • Type: Any

Can be any value that will stored in the created node.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A');
// => Tree { root: Node { key: 10, value: 'A', left: null, right: null } }
tree.internalNodes()
  • Return Type: Array<Node>

Applies in-order traversal to the tree and stores each traversed internal node (node with at least a single non-null child) in an array. The array is returned at the end of the traversal.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(5, 'B').insert(15, 'C').insert(20, 'D');
tree.internalNodes();
//=> [ 
//  Node { left: [Node], right: [Node], key: 10, value: 'A' },
//  Node { left: null, right: [Node], key: 15, value: 'C' } 
// ]
tree.isComplete()
  • Return Type: Boolean

The method returns true if the tree is a complete binary search tree, which implies that every level, except possibly the last, is completely filled, and all nodes are as far left as possible. In any other case, the method returns false.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(5, 'B').insert(15, 'C');
tree.isComplete();
//=> true
tree.insert(3, 'D');
tree.isComplete();
//=> true
tree.insert(20, 'E');
tree.isComplete();
//=> false
tree.isEmpty()
  • Return Type: Boolean

Determines whether the tree is empty, returning true or false as appropriate.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A');
tree.isEmpty();
// => false
tree.isFull()
  • Return Type: Boolean

The method returns true if all the nodes residing in the tree are either leaf nodes or full nodes. In any other case (node degree equal to 1) the method returns false.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(5, 'B').insert(15, 'C');
tree.isFull();
//=> true
tree.insert(8, 'D');
tree.isFull();
//=> false
tree.isPerfect()
  • Return Type: Boolean

The method returns true if all the internal nodes residing in the tree are full nodes (node degree equal to 2) and all leaf nodes are at the same height level. In any other case (node degree equal to 1 or leaf and full nodes are found on the same height level) the method returns false.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(5, 'B').insert(15, 'C');
tree.isPerfect();
//=> true
tree.insert(3, 'D').insert(7, 'E').insert(12, 'F').insert(20, 'G');
tree.isPerfect();
//=> true
tree.insert(1, 'H');
tree.isPerfect();
//=> false
tree.keys()
  • Return Type: Array<Number>

Applies in-order traversal to the tree and stores the key of each traversed node in an array. The array is returned at the end of the traversal.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(5, 'B').insert(15, 'C');
tree.keys();
//=> [ 5, 10, 15 ]
tree.leafNodes()
  • Return Type: Array<Node>

Applies in-order traversal to the tree and stores each traversed leaf node (node without children) in an array. The array is returned at the end of the traversal.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(5, 'B').insert(15, 'C');
tree.leafNodes();
//=> [ 
//  Node { left: null, right: null, key: 5, value: 'B' },
//  Node { left: null, right: null, key: 15, value: 'C' } 
// ]
tree.levelOrder(fn)
  • Return Type: Tree

Applies level-order traversal (breadth-first traversal) to the tree and executes the provided fn function on each traversed node without mutating the tree itself.

fn
  • Type: Function

Function to execute on each node.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(5, 'B').insert(15, 'C');
tree.levelOrder(node => console.log(node.key));
// => 10
// 5
// 15
tree.max()
  • Return Type: Node | null

Returns the right-most node in the tree, thus the node corresponding to the maximum key.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(15, 'B').insert(25, 'C');
tree.max();
// => Node { key: 25, value: 'C', left: null, right: null }
tree.maxKey()
  • Return Type: Number | null

Returns the key of right-most node in the tree, thus the maximum key in the tree.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(15, 'B').insert(25, 'C');
tree.maxKey();
// => 25
tree.maxValue()
  • Return Type: Any | null

Returns the value of right-most node in the tree, thus the value of the node corresponding to the maximum key.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(15, 'B').insert(25, 'C');
tree.maxValue();
// => 'C'
tree.min()
  • Return Type: Node | null

Returns the left-most node in the tree, thus the node corresponding to the minimum key.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(5, 'B').insert(0, 'C');
tree.min();
// => Node { key: 0, value: 'C', left: null, right: null }
tree.minKey()
  • Return Type: Number | null

Returns the key of the left-most node in the tree, thus the minimum key in the tree.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(15, 'B').insert(25, 'C');
tree.minKey();
// => 10
tree.minValue()
  • Return Type: Any | null

Returns the value of the left-most node in the tree, thus the value of the node corresponding to the minimum key.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(15, 'B').insert(25, 'C');
tree.maxValue();
// => 'A'
tree.outOrder(fn)
  • Return Type: Tree

Applies out-order traversal (depth-first traversal - RNL) to the tree and executes the provided fn function on each traversed node without mutating the tree itself.

fn
  • Type: Function

Function to execute on each node.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(5, 'B').insert(15, 'C');
tree.outOrder(node => console.log(node.key));
// => 15
// 10
// 5
tree.postOrder(fn)
  • Return Type: Tree

Applies post-order traversal (depth-first traversal - LRN) to the tree and executes the provided fn function on each traversed node without mutating the tree itself.

fn
  • Type: Function

Function to execute on each node.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(5, 'B').insert(15, 'C');
tree.postOrder(node => console.log(node.key));
// => 5
// 15
// 10
tree.preOrder(fn)
  • Return Type: Tree

Applies pre-order traversal (depth-first traversal - NLR) to the tree and executes the provided fn function on each traversed node without mutating the tree itself.

fn
  • Type: Function

Function to execute on each node.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(5, 'B').insert(15, 'C');
tree.preOrder(node => console.log(node.key));
// => 10
// 5
// 15
tree.remove(key)
  • Return Type: Tree

Mutates the tree by removing the node corresponding to the key argument.

key
  • Type: Number

Can be any number that corresponds to the key of an existing node.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A');
tree.remove(10);
//=> Tree { root: null }
tree.search(key)
  • Return Type: Node | null

Determines whether the tree includes a node with a certain key, returning the targeted node or null as appropriate.

key
  • Type: Number

Node key to search for.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(5, 'B');
tree.search(10);
// => Node { key: 10, value: 'A', left: [Node], right: null }
tree.search(25);
// => null
tree.search(5);
// => Node { key: 5, value: 'B', left: null, right: null }
tree.size()
  • Return Type: Number

Returns the total number of nodes residing in the tree.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(15, 'B').insert(25, 'C');
tree.size();
// => 3
tree.toArray()
  • Return Type: Array<Node>

Applies in-order traversal to the tree and stores each traversed node in an array. The array is returned at the end of the traversal.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(5, 'B').insert(15, 'C').insert(3, 'D').insert(20, 'F');
tree.toArray();
//=> [
//  Node { left: null, right: null, key: 3, value: 'D' },
//  Node { left: [Node], right: null, key: 5, value: 'B' },
//  Node { left: [Node], right: [Node], key: 10, value: 'A' },
//  Node { left: null, right: [Node], key: 15, value: 'C' },
//  Node { left: null, right: null, key: 20, value: 'F' }
// ]
tree.toPairs()
  • Return Type: Array<[Number, Any]>

Applies in-order traversal to the tree and for each traversed node stores in an array of size n, where n the size of the tree, an ordered-pair/2-tuple, where the first element is a number corresponding to the key of the traversed node, and the last one is a value of type any, corresponding to the value stored in the traversed node. The array is returned at the end of the traversal.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(5, 'B').insert(15, 'C').insert(3, 'D').insert(20, 'F');
tree.toPairs();
//=> [ [3, 'D'], [5, 'B'], [10, 'A'], [15, 'C'], [20, 'F'] ]
tree.values()
  • Return Type: Array<Any>

Applies in-order traversal to the tree and stores the value of each traversed node in an array. The array is returned at the end of the traversal.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(5, 'B').insert(15, 'C');
tree.keys();
//=> [ 'B', 'A', 'C' ]

Also available, along with the Tree exposed class, is the Node class, mainly useful for testing purposes, since it can be utilized to compare tree nodes. The class has a binary constructor method, with a key and a value parameter, corresponding to the key and the value stored in the created instance, respectively.

node.key
  • Return Type: Number

The key corresponding to the node instance.

const {Node} = require('avlbinstree');

const node = new Node(10, 'A');
// => { key:10, value: 'A', left: null, right: null }
node.key;
//=> 10
node.value
  • Return Type: Any

The value that the node contains.

const {Node} = require('avlbinstree');

const node = new Node(10, 'A');
// => { key: 10, value: 'A', left: null, right: null }
node.value;
//=> 'A'
node.value = 'B'
// => { key: 10, value: 'B', left: null, right: null }
node.left
  • Return Type: Node | null

The left sub-tree that the node points to.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').root;
// => { key: 10, value: 'A', left: null, right: null }
tree.root.left;
//=> null
tree.insert(5, 'B').root;
// => { key: 10, value: 'A', left: { key: 5, value: 'B', left: null, right: null } , right: null }
tree.root.left;
//=> { key: 5, value: 'B', left: null, right: null }
node.right
  • Return Type: Node | null

The right sub-tree that the node points to.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').root;
// => { key: 10, value: 'A', left: null, right: null }
tree.root.right;
//=> null
tree.insert(15, 'B').root;
// => { key: 10, value: 'A', left: null , right: { key: 15, value: 'B', left: null, right: null } }
tree.root.right;
//=> { key: 15, value: 'B', left: null, right: null }
node.balanceFactor
  • Return Type: Number

Returns a number corresponding to the balance factor of a node, which is defined as the height difference of its two child sub-trees.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').root.balanceFactor;
//=> 0
tree.insert(5, 'B').root.balanceFactor;
//=> 1
tree.remove(5).insert(15, 'C').root.balanceFactor;
//=> -1
node.children
  • Return Type: Array<Node>

Returns an array contacting the children of the instance, where the left child, if present, is the first element of the array, and the right child, if present, is the last element of the array.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').root.children;
//=> []
tree.insert(5, 'B').insert(15, 'C').root.children;
// => [
//  { key: 5, value: 'B', left: null , right: null }, 
//  { key: 15, value: 'C', left: null, right: null }
// ]
node.degree
  • Return Type: Number

Returns the number of sub-trees that the node points to.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').root.degree;
//=> 0
tree.insert(5, 'B').root.degree;
//=> 1
tree.insert(15, 'C').root.degree;
//=> 2
node.height
  • Return Type: Number

Returns the maximum distance of any leaf node from the node instance.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').insert(5, 'B').insert(10, 'C').insert(25, 'D');
tree.root.height;
//=> 2
tree.root.right.height();
//=> 1
node.isBalanced()
  • Return Type: Boolean

Determines whether a node is a balanced (has a balance factor equal to 0), returning true or false as appropriate.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').root.isBalanced();
//=> true
tree.insert(5, 'B').root.isBalanced();
//=> false
node.isFull()
  • Return Type: Boolean

Determines whether a node is a full node (has two non-null children), returning true or false as appropriate.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').root.isFull();
//=> false
tree.insert(5, 'B').insert(15, 'C').root.isFull();
//=> true
node.isInternal()
  • Return Type: Boolean

Determines whether a node is an internal node (has at least one non-null child), returning true or false as appropriate.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').root.isInternal();
//=> false
tree.insert(5, 'B').root.isInternal();
//=> true
node.isLeaf()
  • Return Type: Boolean

Determines whether a node is a leaf node (has no children), returning true or false as appropriate.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').root.isLeaf();
//=> true
tree.insert(5, 'B').root.isLeaf();
//=> false
node.isLeftHeavy()
  • Return Type: Boolean

Determines whether a node is left heavy (has a balance factor greater than zero), returning true or false as appropriate.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').root.isLeftHeavy();
//=> false
tree.insert(5, 'B').root.isLeftPartial();
//=> true
tree.remove(5).insert(10, 'C').root.isLeftPartial();
//=> false
node.isLeftPartial()
  • Return Type: Boolean

Determines whether a node is a left partial node (has ony one left non-null child), returning true or false as appropriate.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').root.isLeftPartial();
//=> false
tree.insert(5, 'B').root.isLeftPartial();
//=> true
node.isPartial()
  • Return Type: Boolean

Determines whether a node is a partial node (has ony one non-null child), returning true or false as appropriate.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').root.isPartial();
//=> false
tree.insert(15, 'B').root.isPartial();
//=> true
node.isRightHeavy()
  • Return Type: Boolean

Determines whether a node is right heavy (has a balance factor less than zero), returning true or false as appropriate.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').root.isRightHeavy();
//=> false
tree.insert(15, 'C').root.isRightHeavy();
//=> true
tree.remove(15).insert(5, 'B').root.isRightHeavy();
//=> false
node.isRightPartial()
  • Return Type: Boolean

Determines whether a node is a right partial node (has ony one right non-null child), returning true or false as appropriate.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').root.isRightPartial();
//=> false
tree.insert(15, 'B').root.isRightPartial();
//=> true
node.leftChildHeight()
  • Return Type: Number

Returns the maximum distance of any leaf node from the left child of the parent node instance. If the parent node has no left child, then -1 is returned.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').root.leftChildHeight();
//=> -1
tree.insert(5, 'B').root.leftChildHeight();
//=> 0
node.maxChildHeight()
  • Return Type: Number

Returns the maximum between the heights of the two child nodes of parent instance. If the parent node has no children, then -1 is returned.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').root.maxChildHeight();
//=> -1
tree.insert(15, 'B').root.maxChildHeight();
//=> 0
tree.insert(5, 'C').root.maxChildHeight();
//=> 0
tree.insert(1, 'D').root.maxChildHeight();
//=> 1
node.rightChildHeight()
  • Return Type: Number

Returns the maximum distance of any leaf node from the right child of the parent node instance. If the parent node has no right child, then -1 is returned.

const {Tree} = require('avlbinstree');

const tree = new Tree();

tree.insert(10, 'A').root.rightChildHeight();
//=> -1
tree.insert(15, 'B').root.rightChildHeight();
//=> 0
node.toPair()
  • Return Type: [Number, Any]

Returns an ordered-pair/2-tuple, where the first element is a number corresponding to the key of the node, and the last one is a value, that can be of any type, corresponding to the value stored in the node.

const {Node, Tree} = require('avlbinstree');

const tree = new Tree();
const node = new Node(5, 'B');

node.toPair();
//=> [5, 'B']
tree.insert(10, 'A').root.toPair();
//=> [10, 'A']

Development

For more info on how to contribute to the project, please read the contributing guidelines.

  • Fork the repository and clone it to your machine
  • Navigate to your local fork: cd avlbinstree
  • Install the project dependencies: npm install or yarn install
  • Lint the code and run the tests: npm test or yarn test
  • binstree - Binary search trees for ES6
  • doublie - Doubly circular & linear linked lists for ES6
  • mheap - Binary min & max heaps for ES6
  • prioqueue - Priority queues for ES6
  • singlie - Singly circular & linear linked lists for ES6

Team

License

MIT

Keywords

FAQs

Package last updated on 30 Jun 2019

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