#include <bits/extc++.h>
#include <atcoder/all>

using namespace std;
using ll = long long;
#define REP(i,n) for(int i=0;i<int(n);i++)
#define FOR(i,a,b) for(int i=a;i<=int(b);i++)
#define ALL(x) x.begin(),x.end()
#define INF INT_MAX
#define INFL LLONG_MAX / 4
using namespace atcoder;
using mint = modint998244353;
template<typename T> void chmin(T& a, T b) { a = min(a, b); }
template<typename T> void chmax(T& a, T b) { a = max(a, b); }
#define PR(x) cerr << #x << "=" << x << endl
using i128 = __int128_t;

int main() {
  int q;
  cin >> q;
  while(q--) {
    int n;
    cin >> n;
    vector<int> a(n);
    REP(i, n) cin >> a[i];
    bool ok = false;
    if(a[0] != a[n-1]) ok = true;
    else {
      REP(i, n-1) {
        if(a[i] != a[0] && a[i+1] != a[0]) {
          ok = true;
          break;
        }
      }
      int cnt = 0;
      REP(i, n-1) {
        if(a[i] != a[i+1]) {
          cnt++;
        }
      }
      if(cnt >= 8) ok = true;
    }
    if(ok) cout << "Yes" << endl;
    else cout << "No" << endl;

  }
  
  return 0;
}