import sys

sys.setrecursionlimit(10 ** 7)
f_inf = float('inf')
mod = 10 ** 9 + 7


def resolve():
    t = int(input())
    for _ in range(t):
        a, b = map(int, input().split())
        cnt = 0
        res = []
        while True:
            for i in reversed(range(60)):
                if a & (1 << i) and not (b & (1 << i)):
                    cnt += 1
                    a += (1 << i)
                    res.append(1 << i)
                    break
            else:
                break

        for i in reversed(range(60)):
            if not (a & (1 << i)) and (b & (1 << i)):
                cnt += 1
                a += (1 << i)
                res.append(1 << i)
        print(cnt)
        print(*res)


if __name__ == '__main__':
    resolve()