Given an array of **n** integers and a positive number **k**. We are allowed to take any k integers from the given array. The task is to find the minimum possible value of the difference between maximum and minimum of **k** numbers.

**Input:**

The first line of input contains an integer T denoting the number of test cases. Each test case contains two integers n and k where n denotes the number of elements in the array a[]. Next line contains space separated n elements in the array a[].

**Output:**

Print an integer which denotes the minimum difference achieved.

**Constraints:**

1<=T<=50

1<=n<=1000

1<=a[i]<=100000

1<=k<=1000

**Example:
Input:**

2

7 3

10 100 300 200 1000 20 30

10 4

1 2 3 4 10 20 30 40 100 200

20

3

Author: shashwat jain

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