#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001

int main(){
	
	int _t;
	cin>>_t;
	rep(_,_t){
		int n;
		cin>>n;
		vector<int> a;
		rep(i,n){
			int x;
			cin>>x;
			if(x!=1)a.push_back(x);
		}
		if(a.size()==0){
			cout<<"No"<<endl;
			continue;
		}
		bool f = true;
		rep(i,a.size()){
			int x = i;
			int y = (i+1)%a.size();
			if(a[x]==a[y])f = false;
		}
		if(f)cout<<"Yes"<<endl;
		else cout<<"No"<<endl;
		
	}
	
	return 0;
}