#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#pragma GCC target( \
    "avx,avx2,fma,sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
using namespace std;
long long MOD = 1e9 + 7;
int main() {
  ios::sync_with_stdio(0), cin.tie(0), cout.tie(0),
      cout << fixed << setprecision(20);
  long long t;
  cin >> t;
  while (t--) {
    long long n, p;
    cin >> n >> p;
    vector<pair<long long, long long> > ans;
    for (int i = 0; i < 2 * n + p; i++) {
      ans.push_back({i % n, (i + i / n + 1) % n});
    }
    for (auto i : ans) {
      cout << i.first + 1 << " " << i.second + 1 << "\n";
    }
  }
}
