from sys import stdin
input = stdin.readline

def RLE(A):
    ans = []
    cnt = 0
    for i in range(len(A)):
        cnt += 1
        if i+1 == len(A) or A[i] != A[i+1]:
            ans.append((A[i], cnt))
            cnt = 0
    return ans

def RLER(A):
    ans = []
    for s, c in A:
        ans.append(s*c)
    return "".join(ans)

from random import randrange
# import A_test

for _ in range(int(input())):
    N = int(input())
    A = list(map(int, input().split()))
    # test
    # N = randrange(1, 11)
    # A = [randrange(2) for _ in range(N)]
    # test

    R = RLE(A)

    if len(R)%2 == 0:
        print("Yes")
        continue
    if 9 <= len(R):
        print("Yes")
        continue

    S = R[0][0]^1
    for n, c in R:
        if n == S and 2 <= c:
            print("Yes")
            break
    else:
        print("No")