#include <cstdlib>
#include <cctype>
#include <cstring>
#include <cstdio>
#include <cmath>
#include <algorithm>
#include <vector>
#include <string>
#include <iostream>
#include <sstream>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <fstream>
#include <numeric>
#include <iomanip>
#include <bitset>
#include <list>
#include <stdexcept>
#include <functional>
#include <utility>
#include <ctime>
using namespace std;
typedef long long LL;
typedef unsigned long long ULL;
#define MEM(a,b) memset((a),(b),sizeof(a))
const LL INF = 1e9 + 7;
const int N = 2e5 + 10;
pair<int, int> vp[N];
int main()
{
	//freopen("input.txt", "r", stdin);
	//freopen("output.txt", "w", stdout);
	int ncase;
	scanf("%d", &ncase);
	while (ncase--)
	{
		int n;
		scanf("%d", &n);
		vector<int> v(n);
		for (auto& x : v)
			scanf("%d", &x);
		while (v.size() >= 2 && v[v.size() - 1] == v[v.size() - 2])
			v.pop_back();
		reverse(v.begin(), v.end());
		while (v.size() >= 2 && v[v.size() - 1] == v[v.size() - 2])
			v.pop_back();
		int cnt = 1;
		for (int i = 1; i < v.size(); i++)
		{
			if (v[i] != v[i - 1])
				cnt++;
		}
		if (cnt == 2 || cnt < v.size())
		{
			puts("Yes");
		}
		else puts("No");
		
	}
	return 0;
}