import sys
sys.setrecursionlimit(10**7)
def main(a,b):
  if b==a:return []
  if 2*a<=b:
    ret=[a]+main(2*a,b)
    return ret
  d=1
  while a+2*d<=b and a%(2*d)==0:
    d*=2
  ary=[d]+main(a+d,b)
  return ary

if __name__=='__main__':
  t=int(input())
  cases=[list(map(int,input().split())) for _ in range(t)]
  for a,b in cases:
    ret=main(a,b)
    print(len(ret))
    print(*ret)