#include <bits/stdc++.h>
using namespace std;
void solve() {
  int n, p;
  int i, j, k;
  int deg[25];
  int adjmat[25][25];
  for (i = 0; i < 25; i++) {
    for (j = 0; j < 25; j++) {
      adjmat[i][j] = 0;
    }
  }
  cin >> n >> p;
  for (i = 0; i < n; i++) {
    cout << i + 1 << " " << (i + 1) % n + 1 << endl;
    adjmat[i][(i + 1) % n] = 1;
    adjmat[(i + 1) % n][i] = 1;
    cout << i + 1 << " " << (i + 2) % n + 1 << endl;
    adjmat[i][(i + 2) % n] = 1;
    adjmat[(i + 2) % n][i] = 1;
  }
  for (i = 0; i < n; i++) {
    deg[i] = 2;
  }
  for (k = 0; k < p; k++) {
    int best = 0x3FFFFFFF;
    int bi, bj;
    for (i = 0; i < n; i++) {
      for (j = i + 1; j < n; j++) {
        if (adjmat[i][j] == 0) {
          if (deg[i] + deg[j] < best) {
            bi = i;
            bj = j;
          }
        }
      }
    }
    adjmat[bi][bj] = 1;
    adjmat[bj][bi] = 1;
    cout << bi + 1 << " " << bj + 1 << endl;
    deg[bi]++;
    deg[bj]++;
  }
}
int main() {
  int n;
  int i;
  cin >> n;
  for (i = 0; i < n; i++) {
    solve();
  }
  return 0;
}
