## https://yukicoder.me/problems/no/2343

def solve(N, A):

    array = []
    for a in A:
        if len(array) == 0:
            array.append([a, 1])
        else:
            if array[-1][0] != a:
                array.append([a, 1])
            else:
                array[-1][1] += 1

    if len(array) % 2 == 0:
        return "Yes"
    
    for _, v in array:
        if v >= 2:
            return "Yes"
    return "No"


def main():
    T = int(input())
    answers = []
    for _ in range(T):
        N = int(input())
        A = list(map(int, input().split()))
        ans = solve(N, A)
        answers.append(ans)

    for ans in answers:
        print(ans)









if __name__ == "__main__":
    main()