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())

        target = 0
        for i in reversed(range(60)):
            if not(a & (1 << i)) and b & (1 << i):
                target = i
                break

        cnt = 0
        res1 = []
        for i in range(60):
            if a & (1 << target):
                break
            elif a & (1 << i):
                cnt += 1
                res1.append(1 << i)
                a += (1 << i)
        res2 = []
        for i in range(60):
            if not (a & (1 << i)) and (b & (1 << i)):
                cnt += 1
                a += (1 << i)
                res2.append(1 << i)
        res = res1 + res2[::-1]
        print(cnt)
        print(*res)


if __name__ == '__main__':
    resolve()