T = int(input())
for _ in range(T):
    N = int(input())
    A = list(map(int, input().split()))

    if N==1:
        print("No")
        continue

    if A[0]!=A[-1]:
        print("Yes")
        continue

    flag = 0
    for i in range(N-1):
        if A[i]==A[i+1]==(1-A[0]):
            flag = 1
            break
    if flag:
        print("Yes")
        continue

    cnt = 0
    for i in range(N):
        if A[i]==(1-A[0]):
            cnt+=1
    if cnt>=4:
        print("Yes")
    else:
        print("No")