T=int(input())
for i in range(T):
  A,B=map(int,input().split())
  P=[]
  for i in range(60):
    if A+(1<<i)>B:
      break
    if A&(1<<i):
      P.append(1<<i)
      A+=(1<<i)
  C=B-A
  for i in range(59,-1,-1):
    if C&(1<<i):
      P.append(1<<i)
      A+=(1<<i)
  print(len(P))
  print(*P)