T=int(input())
for _ in range(T):
    N=int(input())
    A=list(map(int,input().split()))
    now=0
    judge=True
    allone=True
    for i in range(N):
        if A[i]==2:
            now+=1
            allone=False
        elif A[i]==0:
            now-=1
            allone=False
        if now>=2 or now<=-2:
            judge=False
            break
        
    if allone:
        judge=False
        
    if judge:
        print("Yes")
    else:
        print("No")