#include <bits/stdc++.h>
using namespace std;
void fast() {
  ios_base::sync_with_stdio(NULL);
  cin.tie(0);
  cout.tie(0);
}
void online_judge() {
  freopen("input.txt", "r", stdin);
  freopen("output.txt", "w", stdout);
}
const int flag_max = 0x3f3f3f3f;
const long long OO = 1e9;
const double EPS = (1e-7);
int dcmp(double x, double y) { return fabs(x - y) <= EPS ? 0 : x < y ? -1 : 1; }
long long gcd(long long a, long long b) { return !b ? a : gcd(b, a % b); }
long long lcm(long long a, long long b) { return (a / gcd(a, b)) * b; }
int n, p;
int F = 0;
map<pair<int, int>, bool> check;
vector<pair<int, int>> pa_ir;
void dfs(int star) {
  for (int i = star + 1; i <= n; i++) {
    if (!check[{star, i}]) {
      F++;
      check[{star, i}] = 1;
      check[{i, star}] = 1;
      pa_ir.push_back({star, i});
      dfs(i);
    }
  }
}
int main() {
  fast();
  int t;
  cin >> t;
  while (t--) {
    cin >> n >> p;
    p = 2 * n + p;
    pa_ir.clear();
    check.clear();
    dfs(1);
    sort(((pa_ir).begin()), ((pa_ir).end()));
    for (int i = 0; i < p; i++) {
      cout << pa_ir[i].first << ' ' << pa_ir[i].second << '\n';
    }
  }
  return 0;
}
