#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using llu = unsigned long long;
using ld = long double;
const double PI = acos(-1.0), g = 9.80665;
const int unseen = -1;
const ll inf = 1e18 + 505, ninf = -1e18 - 505;
const int MOD = 1000000007;
void solve(void) {
  int n, p;
  cin >> n >> p;
  int vrtc = 0;
  for (int i = 1; i <= n; i++) {
    for (int j = i + 1; j <= n; j++) {
      cout << i << ' ' << j << '\n';
      vrtc++;
      if (vrtc == (2 * n + p)) return;
    }
  }
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
  int testcase = 1;
  cin >> testcase;
  for (int tc = 1; tc <= testcase; tc++) {
    solve();
  }
  return 0;
}
