# Challenge: Find Two Pairs in an Array such that a+b = c+d

If you are given an array, can you find two pairs such that their sum is equal? A solution is placed in the "solution" section to help you, but we would suggest you try to solve it on your own first.

We'll cover the following

## Problem Statement

In this problem, you have to implement the findPair() function to find two pairs or 4 elements (a,b,c,d) in an array, such that,

$a+b = c+d$

You only have to find first two pairs in the array which satisfies the above condition. An illustration is also provided for your understanding.



### Function Prototype:

String findPair(int[] arr);


Here, arr is an Integer array.

### Output:

It returns a String containing two pairs, (a,b) and (c,d), which satisfies a+b = c+d.

### Sample Input

arr = {3, 4, 7, 1, 12, 9}


### Sample Output

"{4,12}{7,9}"


### Explanation

4,12,7 and 9 follow the above condition, as 4+12 = 7+9. There are so many other possible pairs in the sample input that satisfy the above condition, but for this problem, we only have to find one of them.

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