import sys
input = sys.stdin.readline
T = int(input())
for _ in range(T):
    N = int(input())
    A = list(map(int, input().split()))
    in_deg = [0 for _ in range(N)]
    flag = True
    for i in range(N):
        pre = (i-1)%N
        nxt = (i+1)%N
        if A[i]==2:
            if in_deg[pre]+A[pre]>=2 or in_deg[nxt]+A[nxt]>=2:
                flag = False
                break
            in_deg[pre]+=1
            in_deg[nxt]+=1
        elif A[i]==1:
            if in_deg[pre]+A[pre]>=2:
                if in_deg[nxt]+A[nxt]>=2:
                    flag = False
                    break
                else:
                    in_deg[nxt]+=1
            else:
                in_deg[pre]+=1
    for i in range(N):
        if A[i]+in_deg[i]!=2:
            flag = False
            break

    if flag:
        flag = False
        for i in range(N):
            if A[i]!=1:
                flag = True
                break
        if flag:
            print("Yes")
        else:
            print("No")
    else:
        print("No")