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

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int t;
    cin >> t;
    while(t--) {
        int n;
        cin >> n;
        vector<int>a(n);
        for(int i = 0; i < n; i++) cin >> a[i];
        if(a[0] != a[n-1]) cout << "Yes" << "\n";
        else {
            bool f = false;
            for(int i = 0; i+1 < n; i++) {
                if(a[i] == a[i+1] && a[i] == 1-a[0]) {
                    f = true;
                }
            }
            if(f) {
                cout << "Yes" << "\n";
            }
            else {
                int cnt = 0;
                for(int i = 0; i < n; i++) cnt += (a[i] != a[0]);
                cout << ((cnt >= 4)?"Yes":"No") << "\n";
            }
        }
    }
}