from math import gcd
t=int(input())
for _ in range(t):
  a,b=map(int,input().split())
  op=[]
  while b-a>=2:
    if a%2==0 and b%2==0:
      op.append(2)
      a//=2
      b//=2
    elif a%2==0:
      op.append(-1)
      b-=1
    elif b%2==0:
      op.append(1)
      a+=1
    else:
      op.append(1)
      op.append(-1)
      a+=1
      b-=1
  if b-a==1:
    op.append(1)
  by=1
  plus=[]
  minus=[]
  for num in op:
    if num==1:
      plus.append(by)
    elif num==-1:
      minus.append(by)
    else:
      by*=num
  ANS=plus+minus
  print(len(ANS))
  print(*ANS)