def f():
    a, b = map(int, input().split())
    L = []
    R = []
    cnt = 0
    while a < b:
        if a&1:
            L.append(2**cnt)
            a += 1
        if b&1:
            b -= 1
            R.append(2**cnt)
        a //= 2
        b //= 2
        cnt += 1
    res = L + R[::-1]
    print(len(res))
    print(*res)
t = int(input())
for _ in range(t):
    f()