#include <bits/stdc++.h>
using namespace std;
long long t, n, y, i, j, a[5001];
int main() {
  cin >> t;
  for (j = 1; j <= t; j++) {
    cin >> n;
    y = -1;
    cin >> a[1];
    for (i = 2; i <= n; i++) {
      cin >> a[i];
      if (y == -1) {
        if (a[1] != a[i]) y = i;
      }
    }
    if (y == -1) {
      cout << "NO" << endl;
      continue;
    } else
      cout << "YES" << endl;
    for (i = 2; i <= n; i++) {
      if (a[i] == a[1])
        cout << y << " " << i << endl;
      else
        cout << 1 << " " << i << endl;
    }
  }
  return 0;
}
