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

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int T;
    cin >> T;
    auto check2 = [&](int n, vector<int> &a){
        vector<int> c;
        for(int i = 0; i < n; ){
            int pre = i, cnt = 0;
            while(i < n && a[i] == a[pre])i++, cnt++;
            c.emplace_back(cnt);
        }
        if(c.size() % 2 == 0) return true;
        for(int i = 1; i < c.size(); i += 2){
            if(c[i] >= 2) return true;
        }
        if(c.size() >= 9) return true;
        return false;
    };
    while(T--){
        int n;
        cin >> n;
        vector<int> a(n);
        for(auto &&v : a) cin >> v;
        cout << (check2(n, a) ? "Yes" : "No") << '\n';
    }
}