import sys
input = sys.stdin.buffer.readline
sys.setrecursionlimit(10 ** 7)


def calc(A, B):
    res = []
    while A + A <= B:
        res.append(A)
        A += A

    dif = B - A
    cnt = 0
    while A % 2 == 0:
        cnt += 1
        A >>= 1

    while dif:
        for i in reversed(range(cnt + 1)):
            val = 1 << i
            if dif >= val:
                dif -= val
                res.append(val)
                cnt = i + 1
                break
    print(len(res))
    print(*res, sep=" ")


T = int(input())
query = tuple(tuple(map(int, input().split())) for _ in range(T))
for a, b in query:
    calc(a, b)