/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
public static void main (String[] args) throws java.lang.Exception{
		Scanner sc = new Scanner(System.in);
		int q=sc.nextInt();
		for(int j=0; j<q; j++){
			int n=sc.nextInt();
			int k=sc.nextInt();
			int nums[] = new int[n];
			for(int i=0; i<n; i++){
				nums[i]=sc.nextInt();
			}
 
			int res = countDiffOfPairEqualsK(k,nums);
			System.out.println(res);
		}
}
 
	public static int countDiffOfPairEqualsK(int k,int []nums){
		HashMap<Integer,Integer> map = new HashMap<>();
		int cnt=0;
		for(int i=0; i<nums.length; i++){
			if(map.containsKey( nums[i] + k)){
				cnt+=map.get(nums[i] + k);
			}
			map.put(nums[i], map.getOrDefault(nums[i], 0) + 1);
		}
 
		return cnt;
 
	}
}

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16
5
3
1 5 2 4 1
1
0
7
4
0
3 3 3 3
6
-2
1 3 5 7 9 11
5
10
1 2 3 4 5
4
0
-1 -2 -3 -4
6
5
-3 -1 0 2 4 6
2
1
0 1
5
100
100 200 300 400 500
5
-5
-5 -10 -15 -20 -25
7
0
4 4 4 4 4 4 4
6
3
0 1 2 3 4 5
4
999
1000 2000 3000 4000
5
1
1 1 2 2 3
8
-3
10 7 4 1 -2 -5 -8 -11
6
4
-6 -2 0 2 4 6