import sys
input = sys.stdin.readline
for _ in range(int(input())):
  a, b = map(int, input().split())
  if b - a <= 120:
    print(b - a)
    print(*[1] * (b - a))
    continue
  r = len(bin(a ^ b)) - 3
  res = []
  x = 0
  while x < r:
    if a & (1 << x):
      res.append(1 << x)
      a += 1 << x
    x += 1
  x -= 1
  while x >= 0:
    if b & (1 << x):
      res.append(1 << x)
      a += 1 << x
    x -= 1
  print(len(res))
  print(*res)