#include <iostream>
#include <vector>
#include <math.h>

using namespace std;

void er2(long long n) {
    string r;
    while(n!=0) {
        r = r+string(1,'0'+n%2);
        n/=2;
    }
    int l = r.length();
    for(int i = 0; i < l; i++) {
        cout << r[l-i-1];
    }
    if(l == 0) {
        cout << "0"<< endl;
    } else
    {
        cout << endl;
    };
}

vector<int> er(long long n) {
    vector<int> r;
    int c=-1;
    while(n!=0) {
        c++;
        if(n%2 == 1) {
            r.push_back(c);
        }
        n/=2;
    }
    return r;
}

int main(int argc, char** argv) {
    int s;
    cin >> s;
    long long ret[s];
    for(int index = 0; index < s; index++) {
        int n;
        cin >> n;
        int a[n];
        long long ret2 = 0;
        for(int i = 0; i < n+1; i++) {
            cin >> a[i];
        }
        int last = 0;
        for(int i = 1; i <= pow(2,n); i++) {
            vector<int> ks = er(i);
            int f=0;
            for(int j = 0; j < ks.size(); j++) {
                f=f^a[ks[j]];
            }
            if(last == f) {
                ret2++;
            }
            last = f;
        }
        ret[index] = ret2;
    }
    for(int i = 0; i < s; i++) {
        er2(ret[i]);
        //cout << er2(ret[i])<< endl;
    }
    return 0;
}