#include <bits/stdc++.h>
#define ll long long int
using namespace std;


void mainSolve()
{
    int n, x;
    cin >> n;
    vector<ll> v(n);
    unordered_map<ll, ll> m;
    for (int i = 0; i < n; i++)
        cin >> v[i];
    cin>>x;
    for(int i=0;i<n;i++)
    {
         v[i] = (v[i] & x);
        ++m[v[i]];
    }
    ll ans = 0;
    for (auto it : m)
    {
        ll curr = (it.second * it.second);
        ans += curr;
    }
    cout << ans << endl;
}

int main()
{
    int t;
    cin >> t;
    while (t--)
    {
        mainSolve();
    }
    return 0;
}