for _ in range(int(input())):
    a, b = map(int, input().split())
    ans = []
    for d in range(100):
        bit = 1 << d
        if a & bit:
            if a + bit <= b:
                a += bit
                ans.append(bit)
            else:
                break
    rest = b - a
    for d in range(rest.bit_length() - 1, -1, -1):
        bit = 1 << d
        if rest & bit:
            ans.append(bit)
    print(len(ans))
    print(*ans)