func_code_string: #include <bits/stdc++.h>   using namespace std;   using ll = long long;   ll mod = 1e9 + 7;   ll bpow(ll a, ll b, ll m) {     a %= m;     ll res = 1;     while (b > 0) {       if (b & 1) res = res * a % m;       a = a * a % m;       b >>= 1;     }     return res;   }   bool cmp(vector<ll> v1, vector<ll> v2) { return v1[1] < v2[1]; }   ll power(ll x, ll y) {     ll result = 1;     while (y > 0) {       if (y % 2 == 0) {         x = x * x;         y = y / 2;       } else {         result = result * x;         y = y - 1;       }     }     return result;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     int t;     cin >> t;     while (t--) {       ll n;       cin >> n;       ll a[n];       for (int i = 0; i < n; i++) {         cin >> a[i];       }       sort(a, a + n);       ll count = 0;       ll tar = n / 2;       for (int i = 1; i < n; i++) {         cout << a[i] <<     << a[0] << endl;         count++;         if (count == tar) break;       }     }   }   