# import pypyjit;pypyjit.set_param("max_unroll_recursion=-1")
# from bisect import *
# from collections import *
# from heapq import *
# from itertools import *
# from math import *
# from datetime import *
# from decimal import*
# from string import ascii_lowercase,ascii_uppercase
# import numpy as np
import sys
import os

# sys.setrecursionlimit(10**6)
INF = 10**18
MOD = 998244353
# MOD = 10**9 + 7
File = open("input.txt", "r") if os.path.exists("input.txt") else sys.stdin


def input():
    return File.readline().replace("\n", "")


# ///////////////////////////////////////////////////////////////////////////
def RLE(s):
    result = []
    count = 1
    for i in range(1, len(s)):
        if s[i] == s[i - 1]:
            count += 1
        else:
            result.append((s[i - 1], count))
            count = 1
    result.append((s[-1], count))
    return result


T = int(input())
for _ in range(T):
    N = int(input())
    A = list(map(int, input().split()))
    rle = RLE(A)
    if len(rle) % 2 == 0:
        print("Yes")
    else:
        res = 0
        for i in range(len(rle)):
            if i % 2:
                if rle[i][1] > 1:
                    res = 1
        print("Yes" if res else "No")