#include<iostream>
#include<vector>
#include<algorithm>
#include<cstring>
#include<cassert>
#include<cmath>
#include<ctime>
#include<iomanip>
#include<numeric>
#include<stack>
#include<queue>
#include<map>
#include<unordered_map>
#include<set>
#include<unordered_set>
#include<bitset>
#include<random>
#include<functional>
#include<utility>
using namespace std;
void solve();
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int tt = 1;
	cin >> tt;
	while(tt--) solve();
}
int N,A[2 << 17];
void solve()
{
	cin >> N;
	int ex[3] = {};
	for(int i = 0;i < N;i++) cin >> A[i],ex[A[i]] = 1;
	if(!ex[0] || !ex[2])
	{
		cout << "No" << endl;
		return;
	}
	vector<int> idx;
	for(int i = 0;i < N;i++) if(A[i] != 1) idx.push_back(i);
	int M = (int)idx.size();
	for(int i = 0;i < M;i++)
	{
		if(A[idx[i]] == A[idx[(i+1)%M]])
		{
			cout << "No" << endl;
			return;
		}
	}
	cout << "Yes" << endl;
}