import times, strutils, sequtils, math, algorithm, tables, sets, lists, intsets
import critbits, future, strformat, deques
template `max=`(x,y) = x = max(x,y)
template `min=`(x,y) = x = min(x,y)
template `mod=`(x,y) = x = x mod y
template scan2 = (scan(), scan())
template scan3 = (scan(), scan())
let read* = iterator: string {.closure.} =
    while true: (for s in stdin.readLine.split: yield s)
proc scan(): int = read().parseInt
proc scanf(): float = read().parseFloat
proc toInt(c:char): int =
    return int(c) - int('0')




proc solve()=
  var
    t = scan()
    ab = newseqwith(t,(scan(),scan()))
  for i in 0..<t:
    var
      (a,b)=ab[i]
      digit  = (b.float.log2+1).floor.int
      ans = newseq[int]()
    #echo "a:",a.toBin(digit)
    #echo "b:",b.toBin(digit)

    for d in countdown(digit,0):
      if ((b and 1.shl(d))>0) and ((a and 1.shl(d))==0):
        for i in 0..<d:
          if (a and 1.shl(i))>0:
            ans.add(1.shl(i))
            a+=1.shl(i)
      #echo a.toBin(digit)
    for d in countdown(digit-1,0):
      if ((b and 1.shl(d))>0) and ((a and 1.shl(d))==0):
        ans.add(1.shl(d))
        a+=1.shl(d)
      #echo a.toBin(digit)
    echo ans.len
    #echo a==b
    echo ans.join(" ")
    #if a!=b:
      #break
      
     
solve()