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Must Do Interview Preparation

Given an array A of size N, find all combination of four elements in the array whose sum is equal to a given value K. For example, if the given array is {10, 2, 3, 4, 5, 9, 7, 8} and K = 23, one of the quadruple is “3 5 7 8” (3 + 5 + 7 + 8 = 23).

The output should contain only unique quadrples For example, if input array is {1, 1, 1, 1, 1, 1} and K = 4, then output should be only one quadrple {1, 1, 1, 1}

**Input:**

The first line of input contains an integer T denoting the no of test cases. Then T test cases follow. Each test case contains two lines. The first line of input contains two integers N and K. Then in the next line are N space separated values of the array.

**Output:**

For each test case in a new line print all the quadruples present in the array separated by space which sums up to value of K. Each quadruple is unique which are separated by a delimeter "$" and are in increasing order.

**Constraints:**

1 <= T <= 100

1 <= N <= 100

-1000 <= K <= 1000

-100 <= A[] <= 100

**Example:
Input:**

2

5 3

0 0 2 1 1

7 23

10 2 3 4 5 7 8

**Output:**

0 0 1 2 $

2 3 8 10 $2 4 7 10 $3 5 7 8 $

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