#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(n);
		rep(i,n){
			scanf("%d",&a[i]);
		}
		int c = 0;
		rep(i,n-1){
			if(a[i]!=a[i+1])c++;
		}
		
		if(c%2==1){
			cout<<"Yes"<<endl;
			continue;
		}
		
		int t = a[0]^1;
		c = 0;
		rep(i,n-1){
			if(a[i]==t && a[i+1]==t){
				c = 1;
			}
		}
		if(c){
			cout<<"Yes"<<endl;
		}
		else{
			cout<<"No"<<endl;
		}
		
	}
	
	return 0;
}