// #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];
  int pre = -1;
  map<int,int> mpcnt;
  map<int,int> mpdel;
  rep(i,n){
    mpcnt[a[i]]++;
    if (a[i] == pre) mpdel[a[i]]++;
    pre = a[i];
  }
  map<int, int> mp;
  for(int i = mpcnt[0]-mpdel[0]; i <= mpcnt[0]; i++) mp[i]++;
  for(int i = mpcnt[1]-mpdel[1]; i <= mpcnt[1]; i++) mp[i]++;
  for(auto [_, x] : mp) if (x == 2){
    cout << "Yes" << endl;
    return;
  }
  cout << "No" << endl;
}

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