import sys
from itertools import permutations

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

import random

M = 20
f_min = [1] * M
f_max = [0] * M
f_min[1] = f_max[1] = 1
f_min[2] = f_max[2] = 1/2

for n in range(2,M):
    for k in range(1,n):
        if k & 1:
            if n & 1:
                f_min[n] = min(f_min[n],(f_min[k]+f_min[n-k])/2)
                f_max[n] = max(f_max[n],(f_max[k]+f_max[n-k])/2)
            else:
                f_min[n] = min(f_min[n],(f_min[k]+1-f_max[n-k])/2)
                f_max[n] = max(f_max[n],(f_max[k]+1-f_min[n-k])/2)
        else:
            if n & 1:
                f_min[n] = min(f_min[n],(f_min[k]+f_min[n-k])/2)
                f_max[n] = max(f_max[n],(f_max[k]+f_max[n-k])/2)
            else:
                f_min[n] = min(f_min[n],(f_min[k]+f_min[n-k])/2)
                f_max[n] = max(f_max[n],(f_max[k]+f_max[n-k])/2)

#print(f_min)   
    


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 and A.count(0) < 4 else "Yes")