from math import gcd
import sys
sys.setrecursionlimit(10000000)
input = sys.stdin.readline
for _ in range(int(input())):
    a, b = map(int, input().split())
    k = b - a
    res = []
    for i in range(61):
        if k < 1 << i:
            break
        else:
            if a >> i & 1:
                a += 1 << i
                k -= 1 << i
                res.append(1 << i)
    for i in range(60, -1, -1):
        if k >> i & 1:
            res.append(1 << i)
    print(len(res))
    print(" ".join(map(str, res)))