import sys,os,io
input = sys.stdin.readline
#input = io.BytesIO(os.read(0,os.fstat(0).st_size)).readline
T = int(input())
for t in range(T):
  A, B = map(int, input().split())
  n = B.bit_length()
  ans = []
  for i in range(n-1):
    if A&(1<<i):
      A += 1<<i
      ans.append(1<<i)
  for i in range(n-2,-1,-1):
    if B&(1<<i):
      ans.append(1<<i)
  print(len(ans))
  print(*ans)