#include <iostream>
#include <vector>
#include <algorithm>
#include <cassert>
#warning That's the baby, that's not my baby

typedef long long ll;

void solve() {
  int n;
  std::cin >> n;
  int f[n] = {};
  for (int i = 0; i < n; i++) {
    int x;
    std::cin >> x;
    --x;
    f[x]++;
  }
  int gr4 = 0, gr2 = 0;
  for (int i = 0; i < n; i++) {
    if (f[i] >= 4) {
      gr4++;
    } else if (f[i] >= 2) {
      gr2++;
    }
  }
  if (gr4 > 0 || gr2 >= 2) {
    std::cout << "YES\n";
  } else {
    std::cout << "NO\n";
  }
}

int main() {
  std::ios_base::sync_with_stdio(false);
  std::cin.tie(0);

  int t;
  std::cin >> t;
  while (t--) {
    solve();
  }

  return 0;
}