// #define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
using ll = long long;
#define rep(i,n) for (ll i = 0; i < (n); ++i)
using vl = vector<ll>;
using vvl = vector<vl>;
using P = pair<ll,ll>;
#define pb push_back
#define int long long
#define double long double
#define INF (ll) 3e18
// Ctrl + Shift + B コンパイル
// Ctrl + C 中断
// ./m 実行


void solve(){
  int n; cin >> n;
  vl a(n);
  rep(i,n) cin >> a[i];
  if (a[0] != a[n-1]) {cout << "Yes" << endl; return;}
  rep(i,n-1){
    if (a[i] != a[0] && a[i] == a[i+1]){
      cout << "Yes" << endl;
      return;
    }
  }
  cout << "No" << endl;
}

signed main(){
  int t; cin >> t;
  while(t--){
    solve();
  }
}