for _ in range(int(input())):
  a, b = map(int, input().split())
  ans = []
  for i in range(60):
    x = b - a
    if x - (1 << i) > (1 << i) and a & ((1 << (i + 1)) - 1):
      ans.append(1<<i)
      a += 1 << i
  for i in reversed(range(60)):
    x = b - a
    if x & (1 << i):
      ans.append(1<<i)
      a += 1 << i
  print(len(ans))   
  print(*ans)