After keeping the pointers at the desired location, we will compare the sum of pairs with the given sum. Below is the implementation of the above idea : Time Complexity: O(n), to iterate over the arrayAuxiliary Space: O(n), to make a map of size n, At index = 0: freq[sum arr[0]] = freq[6 1] = freq[5] = 0count = 0freq[arr[0]] = freq[1] = 1, At index = 1: freq[sum arr[1]] = freq[6 5] = freq[1] = 1count = 1freq[arr[1]] = freq[5] = 1, At index = 2: freq[sum arr[2]] = freq[6 7] = freq[-1] = 0count = 1freq[arr[2]] = freq[7] = 1, At index = 3: freq[sum arr[3]] = freq[6 (-1)] = freq[7] = 1count = 2freq[arr[3]] = freq[-1] = 1. There was a problem preparing your codespace, please try again. Are you sure you want to create this branch? Largest subset whose all elements are Fibonacci numbers, Maximum area rectangle by picking four sides from array, Root to leaf path with maximum distinct nodes, Length of longest strict bitonic subsequence, Last seen array element (last appearance is earliest), Creative Common Attribution-ShareAlike 4.0 International, Create a map to store frequency of each number in the array. If nothing happens, download GitHub Desktop and try again. If a matching element is found, we print the pair number of times equal to the number of occurrences of the matching element. How to check if two given sets are disjoint? In the next traversal, for every element check if it can be combined with any other element (other than itself!) Example: Input : head : 1 <-> 2 <-> 4 <-> 5 <-> 6 <-> 8 <-> 9 x = 7 Output: (6, 1), (5,2) The expected time complexity is O (n) and auxiliary space is O (1). Given a sorted doubly linked list of positive distinct elements, the task is to find pairs in a doubly-linked list whose sum is equal to given value x, without using any extra space? Print all pairs with given sum. While Movies on Flight asks us to find value closest to target. . for two pairs (u1,v1) and Given an array of integers, and a number 'sum', print all pairs in the array whose sum is equal to 'sum'. Please use ide.geeksforgeeks.org, This approach is based on the following idea: Array after sorting: arr[] = {-1, 1, 5, 7}count = 0, At index = 0: val = sum arr[0] = 6 (-1) = 7count = count + upperBound(1, 3, 7) lowerBound(1, 3, 7)count = 1, At index = 1: val = sum arr[1] = 6 1 = 5count = count + upperBound(2, 3, 5) lowerBound(2, 3, 5)count = 2, At index = 2: val = sum arr[2] = 6 5 = 1count = count + upperBound(3, 3, 1) lowerBound(3, 3, 1)count = 2, Time Complexity: O(n * log(n) ), applying binary search on each elementAuxiliary Space: O(1). In order to find a pair with a given sum in a sorted Doubly Linked List, we can use the two-pointer algorithm by keeping one pointer ( star t) at the head and another ( end) at the end of the list as we can traverse both ways. Count-pairs-with-given-sum-GFG. Method 2 (Use hashing). Input: arr[] = {1, 5, 7, -1}, sum = 6Output: 2Explanation: Pairs with sum 6 are (1, 5) and (7, -1). Print All Distinct Elements of a given integer array, Only integer with positive value in positive negative value in array, Pairs of Positive Negative values in an array, Find Itinerary from a given list of tickets, Find number of Employees Under every Employee, Check if an array can be divided into pairs whose sum is divisible by k, Print array elements that are divisible by at-least one other, Find three element from different three arrays such that that a + b + c = sum, Find four elements a, b, c and d in an array such that a+b = c+d, Find the length of largest subarray with 0 sum, Printing longest Increasing consecutive subsequence, Longest Increasing consecutive subsequence, Longest subsequence such that difference between adjacents is one | Set 2, Largest increasing subsequence of consecutive integers, Count subsets having distinct even numbers, Count distinct elements in every window of size k, Maximum possible sum of a window in an array such that elements of same window in other array are unique, Check if array contains contiguous integers with duplicates allowed, Length of the largest subarray with contiguous elements | Set 2, Find subarray with given sum | Set 2 (Handles Negative Numbers), Find four elements that sum to a given value | Set 3 (Hashmap), Implementing our Own Hash Table with Separate Chaining in Java, Implementing own Hash Table with Open Addressing Linear Probing in C++, Vertical Sum in a given Binary Tree | Set 1, Minimum insertions to form a palindrome with permutations allowed, Check for Palindrome after every character replacement Query, Maximum length subsequence with difference between adjacent elements as either 0 or 1 | Set 2, Maximum difference between frequency of two elements such that element having greater frequency is also greater, Difference between highest and least frequencies in an array, Maximum difference between first and last indexes of an element in array, Maximum possible difference of two subsets of an array, Smallest subarray with k distinct numbers, Longest subarray not having more than K distinct elements, Sum of f(a[i], a[j]) over all pairs in an array of n integers, Find number of pairs in an array such that their XOR is 0, Design a data structure that supports insert, delete, search and getRandom in constant time, Largest subarray with equal number of 0s and 1s, Count subarrays with equal number of 1s and 0s, Longest subarray having count of 1s one more than count of 0s, Count Substrings with equal number of 0s, 1s and 2s, Print all triplets in sorted array that form AP, All unique triplets that sum up to a given value, Count number of triplets with product equal to given number, Count of index pairs with equal elements in an array, Find smallest range containing elements from k lists, Range Queries for Frequencies of array elements, Elements to be added so that all elements of a range are present in array, Count subarrays having total distinct elements same as original array, Count subarrays with same even and odd elements, Minimum number of distinct elements after removing m items, Distributing items when a person cannot take more than two items of same type, Maximum consecutive numbers present in an array, Maximum array from two given arrays keeping order same, Maximum number of chocolates to be distributed equally among k students, Find largest d in array such that a + b + c = d. Find Sum of all unique sub-array sum for a given array. Example 1: Input: nums = [2,7,11,15], target = 9 Output: [0,1] Explanation: Because nums [0] + nums [1] == 9, we return [0, 1]. Example 2: Input: nums = [3,2,4], target = 6 Output: [1,2] Example 3: Input: nums = [3,3], target = 6 Output: [0,1] Explanation: arr[0] + arr[1] = 1 + 5 = 6. and arr[1] + arr[3] = 5 + 1 = 6. Implementation C++ program Open for your suggestions for improvement always!Question Link :-https://practice.geeksforgeeks.org/problems/find-all-pairs-whose-sum-is-x5808/1#For jumping to a particular section use time stamps:-00:00 Introduction01:05 Question and brute force discussion08:00 Writing codePresenting you the best placement preparation course document down here(You can download the sheet and use it as a tracker as per your convenience). Link for the Bro Coders PPC sheet:- https://onedrive.live.com/view.aspx?resid=633D0AA17B58E355!3089\u0026ithint=file%2cdocx\u0026authkey=!APXxsLmWQinD6kE========================================================================Follow us on Instagram:-https://www.instagram.com/bro_codrs/Join the telegram channel for doubts and discussions:-https://t.me/joinchat/wSYWX-gbgoRjNmNl========================================================================Link to our other major series:-Dynamic Programming: https://www.youtube.com/playlist?listGraph: https://www.youtube.com/playlist?list=PLjeQ9Mb66hM3mP90K41_h01OF1EN1AEgGRecursion: https://www.youtube.com/playlist?listBacktracking: https://www.youtube.com/playlist?listGreedy: https://www.youtube.com/playlist?listArray: https://www.youtube.com/playlist?listHashing: https://www.youtube.com/playlist?listLinked List: https://www.youtube.com/playlist?listBinary Search Tree : https://www.youtube.com/watch?v=AxRmy_Ri1TM\u0026list=PLjeQ9Mb66hM3Y_CXcnTLFvXvX74Fu7OKmBinary Tree : https://www.youtube.com/watch?v=I1EEWVbu2SA\u0026list=PLjeQ9Mb66hM3Dforxh8YfyZ3EDwxxHzavStack : https://www.youtube.com/watch?v=R2OcFkOrZWo\u0026list=PLjeQ9Mb66hM2xKb0-iwePeFwzv5Yb5quoQueue : https://www.youtube.com/watch?v=4bDjhyMd2w4\u0026list=PLjeQ9Mb66hM37wIWyBxlsEKRQcLmAnO2QMaths: https://www.youtube.com/watch?v=O9Ceml80V5o\u0026list=PLjeQ9Mb66hM3hgJfIvc32sTRQOpZ2SXxC========================================================================To buy books at excessive cheap prices and sell your old books, visit :- https://www.bookstop.me================================================================================================================================================#BroCoders #LeetCode #InteviewBits #GFG #PlacementCourse #dp #stack #queue #maths #greedy #array #binaryTree #BST #Graphs #recursion #backtracking #string #stl #c++ #java #DSA #CompetitveProgramming #CodeForces #CodeChef #ICPC #CompetitiveCoding #FreePlacementSeries #Microsoft #Google #Amazon #Apple #Facebook #FlipKart #Netflix #TowerResearch #VMWare #DirectI #CodeNation #Infosys #GoldmanSachs #TCS #Tier3 #IIT #NIT #IIIT #Interview #Aptitude #Contest #CodingContest #HackerRank #HackerEarth #BinarySearch #BroCode #Trending #PlacementUpdates #PlacementNotification #IntenshipUpdates #InternshipNotification #LinkedIn #Samsung #Naukri #SoftwareEngineer #Hackathon #SoftwareDevelopmentEngineer #SDE #IT #ComputerScience #CSE #FAANG #DynamicProgramming#LeetCode #Hashing #GeeksForGeeks #MicroSoft #Adobe #Amazon #flipkart #InterviewBit #InterviewQuestion #InterviewBit #Google #Codenation #GFG #Array #DynamicProgramming #GoldmanSacs #SumEqualsToSum #FindallpairswithagivensumGFG #MapofPairsFind all pairs with a given sum | Hashing 11| Placement Preparation Series | Optimized | GFG |Find all pairs with a given sum | Hashing 11| Placement Preparation Series | Optimized | GFG |Find all pairs with a given sum | Hashing 11| Placement Preparation Series | Optimized | GFG |Find all pairs with a given sum | Hashing 11| Placement Preparation Series | Optimized | GFG |Find all pairs with a given sum | Hashing 11| Placement Preparation Series | Optimized | GFG | Please use ide.geeksforgeeks.org, Given two unsorted arrays A of size N and B of size M of distinct elements, the task is to find all pairs from both arrays whose sum is equal to X. Find all the unique quadruple from the given array that sums up to the given number. For better experience watch at 1.25x Here, in this video we have discussed An Optimized Approach for Find all pairs with a given sum Problem Using Hashing. Input: arr[] = {1, 1, 1, 1}, sum = 2Output: 6Explanation: Pairs with sum 2 are (1, 1), (1, 1), (1, 1), (1, 1), (1, 1). You can return the answer in any order. Count of pairs {X, Y} from an array such that sum of count of set bits in X Y and twice the count of set bits in X & Y is M, Count new pairs of strings that can be obtained by swapping first characters of pairs of strings from given array, Count pairs from a given array whose sum lies from a given range, Maximize count of pairs whose Bitwise AND exceeds Bitwise XOR by replacing such pairs with their Bitwise AND, Maximize count of pairs whose bitwise XOR is even by replacing such pairs with their Bitwise XOR, Maximum count of pairs such that element at each index i is included in i pairs, Minimize sum of absolute difference between all pairs of array elements by decrementing and incrementing pairs by 1, Count pairs of indices having sum of indices same as the sum of elements at those indices, Count pairs in an array having sum of elements with their respective sum of digits equal, Count of unique pairs (i, j) in an array such that sum of A[i] and reverse of A[j] is equal to sum of reverse of A[i] and A[j], Find indices of K largest pairs in decreasing order of product from given Array of Pairs, Given an array of pairs, find all symmetric pairs in it, Maximum Count of pairs having equal Sum based on the given conditions, Count of pairs in given Array with product of their values equal to sum of their indices (arr[i]*arr[j] = i+j), C++ Program to Count pairs with given sum, Java Program for Count pairs with given sum, Python Program for Count pairs with given sum, Php Program for Count pairs with given sum, Javascript Program to Count pairs with given sum, Maximize count of odd-sum pairs in given Array with at most one conversion, Count of Pairs in given Array having both even or both odd or sum as K, Maximum count of adjacent pairs with even sum in given Circular Array, Count of adjacent pairs in given Array with even sum, Complete Interview Preparation- Self Paced Course, Data Structures & Algorithms- Self Paced Course. By using our site, you consent to our Cookies Policy. Input: arr[] = {1, 5, 7, -1, 5}, sum = 6Output: 3Explanation: Pairs with sum 6 are (1, 5), (7, -1) & (1, 5). to give the desired sum. Use Git or checkout with SVN using the web URL. Create a map to store the frequency of each number in the array. Given a sorted doubly linked list of positive distinct elements, the task is to find pairs in a doubly-linked list whose sum is equal to given value target. Given an array of integers, and a number sum, find the number of pairs of integers in the array whose sum is equal to sum. Time Complexity : O(n2) Follow the steps below to solve the given problem: Below is the implementation of the above approach. These are discussed below: 1. Run a loop for I in range 0 to n-1 Run a loop for j in range i+1 to n-1; If arr [i]+arr [j] is equal to k, then increament answer by 1. You signed in with another tab or window. Find all the unique quadruple from the given array that sums up to the . We use cookies to provide and improve our services. A tag already exists with the provided branch name. Method 3. Another method to Print all pairs with the given sum is given as follows: Writing code in comment? generate link and share the link here. Below is the implementation of above idea : Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above, This article is attributed to GeeksforGeeks.org. Example 2: Input: N = 4, X = 2. arr[] = {1, 1, 1, 1} Output: 6. After completion of the second traversal, wed have twice the required value stored in counter because every pair is counted two times. Given arr[] = {1, 5, 7, -1}, sum = 6count = 0. Learn more. Using Brute-Force. Illustration: Given arr [] = {1, 5, 7, -1}, sum = 6 A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Full Stack Development with React & Node JS (Live), Preparation Package for Working Professional, Full Stack Development with React & Node JS(Live), GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Check if a pair exists with given sum in given array, Find the Number Occurring Odd Number of Times, Largest Sum Contiguous Subarray (Kadanes Algorithm), Maximum Subarray Sum using Divide and Conquer algorithm, Maximum Sum SubArray using Divide and Conquer | Set 2, Sum of maximum of all subarrays | Divide and Conquer, Finding sum of digits of a number until sum becomes single digit, Program for Sum of the digits of a given number, Compute sum of digits in all numbers from 1 to n, Count possible ways to construct buildings, Maximum profit by buying and selling a share at most twice, Maximum profit by buying and selling a share at most k times, Maximum difference between two elements such that larger element appears after the smaller number, Given an array arr[], find the maximum j i such that arr[j] > arr[i], Sliding Window Maximum (Maximum of all subarrays of size K), Sliding Window Maximum (Maximum of all subarrays of size k) using stack in O(n) time, Next Greater Element (NGE) for every element in given Array, Next greater element in same order as input, Write a program to reverse an array or string. Count pairs with given sum using Binary Search This approach is based on the following idea: If the array is sorted then for each array element arr [i], find the number of pairs by finding all the values ( sum - arr [i]) which are situated after ith index. Given an array of N integers, and an integer K, find the number of pairs of elements in the array whose sum is equal to K. You don't need to read input or print anything. Find elements which are present in first array and not in second, Pair with given sum and maximum shortest distance from end, Pair with given product | Set 1 (Find if any pair exists), k-th missing element in increasing sequence which is not present in a given sequence, Minimum number of subsets with distinct elements, Remove minimum number of elements such that no common element exist in both array, Count items common to both the lists but with different prices, Minimum Index Sum for Common Elements of Two Lists, Change the array into a permutation of numbers from 1 to n, Count pairs from two sorted arrays whose sum is equal to a given value x, Count pairs from two linked lists whose sum is equal to a given value, Count quadruples from four sorted arrays whose sum is equal to a given value x, Number of subarrays having sum exactly equal to k, Count pairs whose products exist in array, Given two unsorted arrays, find all pairs whose sum is x, Cumulative frequency of count of each element in an unsorted array, Sort elements by frequency | Set 4 (Efficient approach using hash), Find pairs in array whose sums already exist in array, Find all pairs (a, b) in an array such that a % b = k, Convert an array to reduced form | Set 1 (Simple and Hashing), Return maximum occurring character in an input string, Smallest element repeated exactly k times (not limited to small range), Numbers with prime frequencies greater than or equal to k, Find the first repeating element in an array of integers, Find sum of non-repeating (distinct) elements in an array. For eg. The differences between Find Pair With Given Sum and Movies on Flight are: Find Pair With Given Sum asks us to find exactly the target, that's why using a map in Find Pair With Given Sum is a good idea. Writing code in comment? (Single traversal is required). POTD. pair (a, b) and (b, a) are considered as different pairs till now. . If nothing happens, download Xcode and try again. No description, website, or topics provided. Given an array of integers, and a number 'sum', find the number of pairs of integers in the array whose sum is equal to 'sum'. and is attributed to GeeksforGeeks.org, Index Mapping (or Trivial Hashing) with negatives allowed, Print a Binary Tree in Vertical Order | Set 2 (Map based Method), Find whether an array is subset of another array | Added Method 3, Union and Intersection of two linked lists | Set-3 (Hashing), Given an array A[] and a number x, check for pair in A[] with sum as x, Minimum delete operations to make all elements of array same, Minimum operation to make all elements equal in array, Maximum distance between two occurrences of same element in array, Check if a given array contains duplicate elements within k distance from each other, Find duplicates in a given array when elements are not limited to a range, Find top k (or most frequent) numbers in a stream, Smallest subarray with all occurrences of a most frequent element, First element occurring k times in an array, Given an array of pairs, find all symmetric pairs in it, Find the only repetitive element between 1 to n-1, Find any one of the multiple repeating elements in read only array, Group multiple occurrence of array elements ordered by first occurrence. Your task is to complete the function getPairsCount() which takes arr[], n and k as input parameters and returns the number of pairs that have sum K. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. In the next traversal, for every element check if it can be combined with any other element (other than itself!) Practice Problems, POTD Streak, Weekly Contests & More! Given an array of integers, and a number sum, print all pairs in the array whose sum is equal to sum. Note that the worst case of time complexity of this solution is O(c + n) where c is the count of pairs with a given sum. By using our site, you (Single traversal is required). generate link and share the link here. Time Complexity: O(n2), traversing the array for each elementAuxiliary Space: O(1). &nbsp; Example 1: Input: 1 &lt;-&gt; 2 &lt;-&gt; 4 &lt;-&gt; 5 &lt;-&gt; 6 &lt; Find Pair With Given Sum gives valid input, while in Movies on Flight you need . Return answer. Input: arr[] = {10, 12, 10, 15, -1, 7, 6, 5, 4, 2, 1, 1, 1}, sum = 11Output: 9Explanation: Pairs with sum 11 are (10, 1), (10, 1), (10, 1), (12, -1), (10, 1), (10, 1), (10, 1), (7, 4), (6, 5). Given an array of integers and another number. Given an array of N integers, and a number sum, the task is to find the number of pairs of integers in the array whose sum is equal to sum. Increment the counter accordingly. This work is licensed under Creative Common Attribution-ShareAlike 4.0 International Hope you like the video . Minimize sum of absolute difference between all pairs of array elements by decrementing and incrementing pairs by 1, Given an array of pairs, find all symmetric pairs in it, Print all the sum pairs which occur maximum number of times, Print all pairs in an unsorted array with equal sum, Print distinct absolute differences of all possible pairs from a given array, Perfect Sum Problem (Print all subsets with given sum), Sum of XOR of sum of all pairs in an array, Count new pairs of strings that can be obtained by swapping first characters of pairs of strings from given array, Find indices of K largest pairs in decreasing order of product from given Array of Pairs, Print all repeating adjacent pairs in sorted order from an array, Print all the pairs that contains the positive and negative values of an element, For all Array elements find Product of Sum of all smaller and Sum of all greater elements, Sum of squares of distances between all pairs from given points, Sum of floor division of all pairs from given array, Minimize sum of an array having Bitwise AND of all its pairs present in a given matrix, Find XOR sum of Bitwise AND of all pairs from given two Arrays, Maximize sum of LSBs of Bitwise OR of all possible N/2 pairs from given Array, Find sum of XNOR of all unordered pairs from given Array, Sum of product of all unordered pairs in given range with update queries, Sum of absolute differences of all pairs in a given array, Given two arrays count all pairs whose sum is an odd number, Given two unsorted arrays, find all pairs whose sum is x, Count of replacements required to make the sum of all Pairs of given type from the Array equal, Sum of Bitwise OR of all pairs in a given array, Complete Interview Preparation- Self Paced Course, Data Structures & Algorithms- Self Paced Course. There are several methods to solve this problem using brute-force, sorting, and hashing. Auxiliary Space : O(1). The above also contains repeated pairs from front and last, i.e. After completion of second traversal, wed have twice the required value stored in counter because every pair is counted two times. Explanation: A simple solution is to traverse each element and check if theres another number in the array which can be added to it to give sum. Increment the counter accordingly. Input: N = 5, K = 3 A[] = {0,0,2,1,1} Output: 0 0 1 2 $ Explanation: Sum of 0, 0, 1, 2 is . Problems Courses Get Hired Contests. Hence divide count by 2 and return. At index = 0: freq[sum arr[0]] = freq[6 1] = freq[5] = 1, At index = 1: freq[sum arr[1]] = freq[6 5] = freq[1] = 1, At index = 2: freq[sum arr[2]] = freq[6 7] = freq[-1] = 1, At index = 3: freq[sum arr[3]] = freq[6 (-1)] = freq[7] = 1. By using our site, you We can iterate over all the pairs of the given array, and then count the pairs whose sum is equal to K. Algorithm Initialize a variable answer=0. acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Full Stack Development with React & Node JS (Live), Preparation Package for Working Professional, Full Stack Development with React & Node JS(Live), GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Check if a pair exists with given sum in given array, Find the Number Occurring Odd Number of Times, Largest Sum Contiguous Subarray (Kadanes Algorithm), Maximum Subarray Sum using Divide and Conquer algorithm, Maximum Sum SubArray using Divide and Conquer | Set 2, Sum of maximum of all subarrays | Divide and Conquer, Finding sum of digits of a number until sum becomes single digit, Program for Sum of the digits of a given number, Compute sum of digits in all numbers from 1 to n, Count possible ways to construct buildings, Maximum profit by buying and selling a share at most twice, Maximum profit by buying and selling a share at most k times, Maximum difference between two elements such that larger element appears after the smaller number, Given an array arr[], find the maximum j i such that arr[j] > arr[i], Sliding Window Maximum (Maximum of all subarrays of size K), Sliding Window Maximum (Maximum of all subarrays of size k) using stack in O(n) time, Next Greater Element (NGE) for every element in given Array, Next greater element in same order as input, Maximum product of indexes of next greater on left and right, Write a program to reverse an array or string, If the array is sorted then for each array element, Find the index of the first element having value same or just greater than, Find the index of the first element having value just greater than, The gap between these two indices is the number of elements with value same as (. Examples: Input : arr[] = A naive solution is to consider every pair in the given array and return if the desired sum is found. to give the desired sum. Now we traverse through the array and check for pairs in the hash table. Work fast with our official CLI. Note: All pairs should be printed in increasing order of u. We create an empty hash table. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. learn about Codespaces. Examples : Input : arr [] = {1, 5, 7, -1, 5}, sum = 6 Output : (1, 5) (7, -1) (1, 5) Input : arr [] = {2, 5, 17, -1}, sum = 7 Output : (2, 5) . You don't have access just yet, but in the meantime, you can Given an array of N integers, and an integer K, find the number of pairs of elements in the array whose sum is equal to K. Example 1: Input: N = 4, K = 6. arr[] = {1, 5, 7, 1} Output: 2. For better experience watch at 1.25x Here, in this video we have discussed An Optimized Approach for Find all pairs with a given sum Problem Using Hashing. A better solution is possible in O(n) time. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. k-th distinct (or non-repeating) element in an array. 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