def ip():return int(input())
def mp():return map(int, input().split())
def lmp():return list(map(int, input().split()))
T = ip()
from collections import defaultdict
def solve():
    N = ip()
    A = lmp()
    B = []
    for a in A:
        if a == 1:
            continue
        B.append(a)
    if len(B) == 0:
        print('No')
        return
    # B.append(B[0])
    # print(B)
    for i in range(len(B)):
        if B[i-1] == B[i]:
            print('No')
            return
    print('Yes')
for _ in range(T):
    solve()