for _ in range(int(input())):
    n = int(input())
    A = list(map(int, input().split()))
    B = [A[0]]
    for i in range(1, n):
        if A[i] == A[i - 1]:
            continue
        B.append(A[i])
    if B[0] == 1:
        if len(B) == 1:
            print("No")
        else:
            print("Yes")
    else:
        if len(B) % 2 == 0:
            print("Yes")
        else:
            seq_1 = False
            cnt = 0
            for i in range(n):
                if A[i] == 0:
                    cnt = 0
                else:
                    cnt += 1
                    if cnt > 1:
                        seq_1 = True
                        break
            if seq_1:
                print("Yes")
            else:
                print("No")