import sys
from itertools import permutations

input = lambda :sys.stdin.readline().rstrip()
mi = lambda :map(int,input().split())
li = lambda :list(mi())

import random

for _ in range(int(input())):
    N = int(input())
    A = li()

    k = A.count(1)
    if k < N-k:
        A = [1-a for a in A]
    
    if A[0] == 0 or A[-1] == 0:
        print("Yes")
        continue

    flg = True
    for i in range(1,N-1):
        if A[i] == 0:
            if A[i-1] == 0 or A[i+1] == 0:
                flg = False
    
    print("No" if flg else "Yes")