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):
# from itertools import groupby, accumulate, product, permutations, combinations
# for com in combinations(range(1,100),2):
  # A,B = com
  # print(A,B)
  A, B = map(int, input().split())
  n = B.bit_length()
  m = A.bit_length()
  ans = []
  for i in range(n-1):
    if A&(1<<i):
      if A+(1<<i)>B:
        break
      A += 1<<i
      ans.append(1<<i)
  for i in range(n-2,-1,-1):
    if B&(1<<i) and not A&(1<<i):
      ans.append(1<<i)
  print(len(ans))
  print(*ans)