import sys
def input():
	return sys.stdin.buffer.readline()[:-1]

for _ in range(int(input())):
	a, b = map(int, input().split())
	res = []
	l = b.bit_length()
	for i in range(l-1, -1, -1):
		if (a >> i) & 1 != (b >> i) & 1:
			lim = i
			break
	for i in range(lim):
		if (a >> i) & 1:
			res.append(1 << i)
			a += (1 << i)
	for i in range(lim, -1, -1):
		if (b >> i) & 1 == 1 and (a >> i) & 1 == 0:
			res.append(1 << i)
	print(len(res))
	print(*res)