#include <bits/stdc++.h>
using namespace std;
int main() {
  int t;
  cin >> t;
  while (t--) {
    int n;
    cin >> n;
    int a[n];
    for (int i = 0; i < n; i++) cin >> a[i];
    int flag = 0;
    for (int i = 0; i < n; i++) {
      if (a[i] != a[0]) {
        flag = 1;
        break;
      }
    }
    if (flag == 0)
      cout << "NO\n";
    else {
      cout << "YES\n";
      for (int i = 0; i < n; i++)
        if (a[i] != a[0]) cout << "1 " << i + 1 << endl;
      int ind;
      for (int i = 0; i < n; i++) {
        if (a[i] != a[0]) {
          ind = i;
          break;
        }
      }
      for (int i = 1; i < n; i++)
        if (a[i] == a[0]) cout << ind + 1 << " " << i + 1 << endl;
    }
  }
  return 0;
}
