#include<iostream>
#include<vector>
using namespace std;
int N,A[2<<17];
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int T;
	cin>>T;
	for(;T--;)
	{
		cin>>N;
		for(int i=0;i<N;i++)cin>>A[i];
		vector<pair<int,int> >a;
		for(int i=0;i<N;i++)
		{
			if(a.empty()||a.back().first!=A[i])a.push_back(make_pair(A[i],1));
			else a.back().second++;
		}
		if(a.size()==1)
		{
			cout<<"No\n";
			continue;
		}
		else if(a.size()%2==0)
		{
			cout<<"Yes\n";
			continue;
		}
		bool fn=a.size()>=9;
		for(int i=1;i<a.size();i+=2)if(a[i].second>=2)fn=true;
		cout<<(fn?"Yes\n":"No\n");
	}
}