#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
template<class T> void check_min(T &a, const T &b){ a = (a < b) ? a : b; }
template<class T> void check_max(T &a, const T &b){ a = (a > b) ? a : b; }
#define all(x) (x).begin(), (x).end()

int main(){
    ios::sync_with_stdio(false);
    cin.tie(NULL);

    int t;
    cin >> t;
    
    while(t--){
        int n;
        cin >> n;

        vector<int> b(n);
        for(int &x: b)
            cin >> x;
        sort(all(b));

        bool ok = true;
        for(int i = 1; i < n; ++i)
            if((b[i] & b[0]) != b[0])
                ok = false;

        if(!ok){
            cout << -1 << "\n";
            continue;
        }

        cout << b[0] << " ";
        for(int i = 1; i < n; ++i)
            cout << b[i] << " " << b[0] << " ";
        cout << "\n"; 
    }
}