T = int(input())
for _ in range(T):
    A, B = map(int, input().split())
    ans = []
    for i in range(61):
        two = 1 << i
        if A & two and A + two <= B:
            ans.append(two)
            A += two
    
    for i in range(61, -1, -1):
        two = 1 << i
        if A + two <= B:
            ans.append(two)
            A += two

    print(len(ans))
    print(*ans)