#include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     int t, n, num;     cin >> t;     while (t--) {       cin >> n;       bool flag = false;       unordered_map<int, vector<int>> m;       for (int i = 0; i < n; ++i) {         cin >> num;         m[num].push_back(i);       }       for (auto& k : m) {         if (k.second.back() - k.second.front() >= 2) {           flag = true;           break;         }       }       if (flag)         cout <<  YES n ;       else         cout <<  NO n ;     }     return 0;   }   