for __ in range(int(input())):
    a, b = map(int, input().split())
    res = []
    while a < b:
        d = (a ^ b) >> 1
        d |= d >> 1
        d |= d >> 2
        d |= d >> 4
        d |= d >> 8
        d |= d >> 16
        d |= d >> 32
        bf = b & ~d
        d = a ^ bf
        d &= -d
        assert a < a + d <= b
        a += d
        res.append(d)
    print(len(res))
    print(*res)