#include <bits/stdc++.h>
using namespace std;
vector<string> vec_splitter(string s) {
  s += ',';
  vector<string> res;
  while (!s.empty()) {
    res.push_back(s.substr(0, s.find(',')));
    s = s.substr(s.find(',') + 1);
  }
  return res;
}
void debug_out(vector<string> __attribute__((unused)) args,
               __attribute__((unused)) int idx,
               __attribute__((unused)) int LINE_NUM) {
  cerr << endl;
}
template <typename Head, typename... Tail>
void debug_out(vector<string> args, int idx, int LINE_NUM, Head H, Tail... T) {
  if (idx > 0)
    cerr << ", ";
  else
    cerr << "Line(" << LINE_NUM << ") ";
  stringstream ss;
  ss << H;
  cerr << args[idx] << " = " << ss.str();
  debug_out(args, idx + 1, LINE_NUM, T...);
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  ;
  int tcc;
  cin >> tcc;
  for (int tc = 1; tc <= tcc; tc++) {
    int n, k;
    cin >> n >> k;
    int cnt = 0;
    int cur1 = 1, cur2 = 2;
    for (; cnt < 2 * n + k && cur1 <= n;) {
      cout << cur1 << " " << cur2 << "\n";
      cnt++;
      cur2++;
      if (cur2 == n + 1) {
        cur1++;
        cur2 = 1 + cur1;
      }
    }
  }
}
