// #pragma GCC target("avx")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")

#include <bits/stdc++.h>
using namespace std;

#define rep(i,n) for(int i = 0; i < (int)n; i++)
#define FOR(n) for(int i = 0; i < (int)n; i++)
#define repi(i,a,b) for(int i = (int)a; i < (int)b; i++)
#define all(x) x.begin(),x.end()
//#define mp make_pair
#define vi vector<int>
#define vvi vector<vi>
#define vvvi vector<vvi>
#define vvvvi vector<vvvi>
#define pii pair<int,int>
#define vpii vector<pair<int,int>>

template<typename T>
void chmax(T &a, const T &b) {a = (a > b? a : b);}
template<typename T>
void chmin(T &a, const T &b) {a = (a < b? a : b);}

using ll = long long;
using ld = long double;
using ull = unsigned long long;

const ll INF = numeric_limits<long long>::max() / 2;
const ld pi = 3.1415926535897932384626433832795028;
const ll mod = 998244353;
int dx[] = {1, 0, -1, 0, -1, -1, 1, 1};
int dy[] = {0, 1, 0, -1, -1, 1, -1, 1};

#define int long long

template<typename T>
vector<pair<T, int>> run_length_encoding(vector<T> s) {
    T need = s[0];
    int cnt = 0;
    vector<pair<T, int>> ret;
    for(T c : s) {
        if(c == need) {
            cnt++;
        }else {
            ret.emplace_back(need, cnt);
            need = c;
            cnt = 1;
        }
    }
    if(cnt != 0) ret.emplace_back(need, cnt);
    return ret;
}

void solve() {
    int n;
    cin >> n;
    vi a(n);
    FOR(n) cin >> a[i];
    
    vpii run = run_length_encoding<int>(a);

    if((int)run.size()%2 == 0) {
        cout << "Yes" << endl;
        return;
    }

    repi(i, 1, (int)run.size()-1) {
        if(run[i].second > 1) {
            cout << "Yes" << endl;
            return;
        }
    }

    cout << "No" << endl;
}

signed main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int t;
    cin >> t;
    while(t--) solve();
    return 0;
}