#include <bits/stdc++.h>

using namespace std;

void test_case(int tc){
    int n;
    cin >> n;

    vector<int> seq(n);

    for(int i = 0; i < n; ++i){
        cin >> seq[i];
    }

    sort(seq.begin(), seq.end());

    for(int i = 1; i < n / 2 + 1; ++i){
        cout << seq[i] << " " << seq[0] << "\n";
    }

}



int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);

    int t;
    cin >> t;

    for(int tc = 1; tc <= t; ++tc){
        test_case(tc);
    }

    cout << flush;

    return 0;
}