import os,io
input=io.BytesIO(os.read(0,os.fstat(0).st_size)).readline
t=int(input())
for _ in range(t):
  a,b=map(int,input().split())
  ans=[]
  for i in range(70):
    if a+(1<<i)<=b and a&(1<<i):
      ans.append(str(1<<i))
      a+=1<<i
  for i in range(69,-1,-1):
    if a+(1<<i)<=b:
      ans.append(str(1<<i))
      a+=1<<i
  print(len(ans))
  print(' '.join(ans))