#include <bits/stdc++.h>
using namespace std;
 
int main() {
	int t;
	cin >> t;
	while(t--)
	{
		int n,k,c=0;
		cin >> n >> k;
		vector<int> v;
		for(int i=0;i<n;i++)
		{
			int a;
			cin >> a;
			v.push_back(a);
		}
		sort(v.begin(),v.end());
		int i=0,j=n-1;
		while(i<j)
		{
			if(v[i]+v[j]==k)
			{
				c++;
				i++;
				j--;
			}
			else if(v[i]+v[j]<k)
			{
				i++;
			}
			else
			{
				j--;
			}
		}
		cout << c << endl;
	}
	return 0;
}

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NAo0IDQKMSAyIDMgMgo4IDE1CjEgMiAzIDQgNSA2IDcgOAo2IDEKMSAxIDEgMSAxIDEKMTYgOQozIDEgNCAxIDUgOSAyIDYgNSAzIDUgOCA5IDcgOSAzCg==

4
4 4
1 2 3 2
8 15
1 2 3 4 5 6 7 8
6 1
1 1 1 1 1 1
16 9
3 1 4 1 5 9 2 6 5 3 5 8 9 7 9 3