#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <atcoder/modint>
using namespace std;
using i32 = int;
using u32 = unsigned int;
using i64 = long long;
using u64 = unsigned long long;
#define rep(i,n) for(int i=0; i<(int)(n); i++)
const i64 INF = 1001001001001001001;

using Modint = atcoder::static_modint<998244353>;



int main(){
    int T; cin >> T;
    rep(t,T){
        int N; cin >> N;
        vector<int> A(N); rep(i,N) cin >> A[i];
        int reps[2] = {};
        rep(i,N-1) if(A[i] == A[i+1]) reps[A[i]] = 1;
        int cnt1 = 0;
        rep(i,N) cnt1 += A[i];
        int cnt0 = N - cnt1;
        bool ans = true;
        if(cnt0 == 0 || cnt1 == 0) ans = false;
        if(A[0] == 0 && A.back() == 0 && reps[1] == 0) ans = false;
        if(A[0] == 1 && A.back() == 1 && reps[0] == 0) ans = false;
        cout << (ans ? "Yes\n" : "No\n");
    }
    return 0;
}



struct ios_do_not_sync{
    ios_do_not_sync(){
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
    }
} ios_do_not_sync_instance;