#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  int t;
  cin >> t;
  while (t--) {
    int n, p, x = 1, cnt = 0, i = 1;
    cin >> n >> p;
    while (cnt < 2 * n + p) {
      cout << i << " " << ++x << endl;
      cnt++;
      if (x == n) x = ++i;
    }
  }
  return 0;
}
