import sys
from sys import stdin

TT = int(stdin.readline())

for loop in range(TT):

    N = int(stdin.readline())
    A = list(map(int,stdin.readline().split()))

    if A[0] == 1:
        for i in range(N):
            A[i] ^= 1
        

    if A[-1] == 1:
        print ("Yes")
    else:

        flag = False
        for i in range(len(A)-1):
            if A[i] == A[i+1] == 1:
                flag = True

        if sum(A) >= 4:
            flag = True

        if flag:
            print ("Yes")
        else:
            print ("No")