from cmath import inf
from re import M
import sys
from collections import deque, Counter
from math import atan2, gcd, log10, pi, sqrt, ceil
from bisect import bisect, bisect_left, bisect_right, insort
from typing import Iterable, TypeVar, Union, Tuple, Iterator, List
# import bisect
from decimal import *
import time
import copy
import heapq
import itertools
import math
import random
from fractions import Fraction
from functools import lru_cache, partial, cmp_to_key
import operator
# import pypyjit
# pypyjit.set_param('max_unroll_recursion=-1')
# import string
# import networkx as nx
input = sys.stdin.readline
sys.setrecursionlimit(10000000)
mod = 10 ** 9 + 7
mod2 = 998244353
# mod = 1 << 128
# mod = 10 ** 30 + 1
INF = 1 << 61
DIFF = 10 ** -9
DX = [1, 0, -1, 0, 1, 1, -1, -1]
DY = [0, 1, 0, -1, 1, -1, 1, -1]

def read_values(): return map(int, input().split())
def read_index(): return map(lambda x: int(x) - 1, input().split())
def read_list(): return list(read_values())
def read_lists(N): return [read_list() for _ in range(N)]
                          
            
def main():
    t=int(input())
    for _ in range(t):
        n=int(input())
        a=read_list()
        if a[0]+a[-1]==1:
            print('Yes')
            continue
        ok=False
        for i in range(n-1):
            ok|=a[0]+a[i]==1 and a[0]+a[i+1]==1
        if ok:
            print('Yes')
        else:
            print('No')

if __name__ == "__main__":
    main()