I,L,P=input,len,print
t=int(I())
for _ in range(t):
 a,b=map(int,I().split());l,r,C=[],[],0
 while a<b:
  if a%2:l.append(2**C);a+=1
  if b%2:r.append(2**C);b-=1
  a//=2;b//=2;C+=1
 P(L(l)+L(r));P(*(l+r[::-1]))