#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  int t;
  cin >> t;
  while (t--) {
    int n;
    cin >> n;
    vector<int> a(n);
    map<int, int> cur;
    set<pair<int, int>> st;
    for (int i = 0; i < n; i++) {
      cin >> a[i];
      if (!cur.count(a[i])) {
        st.insert(make_pair(a[i], i));
      }
      cur[a[i]] = i;
    }
    if (st.size() == 1) {
      cout << "NO" << endl;
      continue;
    } else {
      cout << "YES" << endl;
      vector<pair<int, int>> res;
      auto e = st.begin(), g = prev(st.end());
      for (int i = 0; i < n; i++) {
        if (a[i] != e->first) {
          res.emplace_back(i + 1, e->second + 1);
        } else if (i != g->second && i != e->second)
          res.emplace_back(i + 1, g->second + 1);
      }
      for (auto j : res) cout << j.first << " " << j.second << endl;
    }
  }
  return 0;
}
