import scala.annotation.tailrec
import scala.collection.mutable.ArrayBuffer
import scala.io.StdIn.*
import scala.math.*

@main def main =
  val testCase = readLine().toInt
  for _ <- 0 until testCase do
    val Array(a, b) = readLine().split(' ').map(_.toLong)
    var current = a
    val op = ArrayBuffer[Long]()
    for i <- 0 until 60 do
      val d = 1L << i
      if (current & d) != 0L && current + d <= b then
        current += d
        op.addOne(d)
    for i <- 59 to 0 by -1 do
      val d = 1L << i
      if current + d <= b then
        current += d
        op.addOne(d)
    println(op.length)
    println(op.mkString(" "))