import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################
for _ in range(ni()):
    n = ni()
    a = na()
    if n == 1:
        No()
    elif a[0] != a[-1]:
        Yes()
    else:
        ok = 0
        for i in range(n-1):
            if a[i] == a[i+1] == 1-a[0]:
                ok = 1
                break
        if ok:
            Yes()
        else:
            No()