#include <bits/stdc++.h>   #pragma comment(linker,  /STACK:102400000,102400000 )   using namespace std;   const int inf = 1e9 + 7;   const long long linf = 1e18;   const double pi = acos(-1.0);   int main() {     ios::sync_with_stdio(false);     int t;     cin >> t;     for (int total = 0; total < t; total++) {       int n, p;       cin >> n >> p;       for (int temp = 0; temp < 2 * n + p;) {         for (int i = 1; i <= n; i++) {           if (temp == 2 * n + p) break;           for (int j = i + 1; j <= n; j++) {             temp++;             cout << i <<     << j << endl;             if (temp == 2 * n + p) break;           }         }       }     }     return 0;   }   