import collections,sys,math,functools,operator,itertools,bisect,heapq,decimal,string,time,random
#sys.setrecursionlimit(10**9)
#sys.set_int_max_str_digits(0)


#alist = []
#s = input()
t = int(input())
for _ in range(t):
    n = int(input())
    alist = list(map(int,input().split()))
    if sum(alist) != n:
        print('No')
        continue
    c = 0
    for i in range(n):
        if alist[i] == 2:
            if alist[i-1] == 2 or alist[(i+1)%n] == 2:
                print('No')
                c = 1
                break
        if alist[i] == 1:
            if alist[i-1] == 2 and alist[(i+1)%n] == 2:
                print('No')
                c = 1
                break
    if alist.count(2) == 0:
        print('No')
        c = 1
    if not c:
        print('Yes')