package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	defer writer.Flush()
	T := ReadInt()
	for t := 0; t < T; t++ {
		A, B := ReadInt(), ReadInt()
		solve(A, B)
	}
}

func solve(A, B int) {
	ans := make([]int, 0)
	N := 60

	var l int
	for i := N; i >= 0; i-- {
		if A>>i&1 == 0 && B>>i&1 == 1 {
			l = i
			break
		}
	}

	for i := 0; i < l; i++ {
		if A>>i&1 == 1 {
			A += 1 << i
			ans = append(ans, 1<<i)
		}
	}

	for i := l - 1; i >= 0; i-- {
		if A>>i&1 == 0 && B>>i&1 == 1 {
			ans = append(ans, 1<<i)
		}
	}

	Println(len(ans))
	for i := 0; i < len(ans); i++ {
		if i > 0 {
			Printf(" ")
		}
		Printf("%d", ans[i])
	}
	Println()
}

var reader = bufio.NewReader(os.Stdin)

func Scan(a ...interface{}) {
	if _, err := fmt.Fscan(reader, a...); err != nil {
		panic(err)
	}
}
func ReadInt() (i int)       { Scan(&i); return }
func ReadString() (s string) { Scan(&s); return }
func ReadInts(n int) (a []int) {
	for i := 0; i < n; i++ {
		a = append(a, ReadInt())
	}
	return
}

var writer = bufio.NewWriter(os.Stdout)

func Printf(format string, a ...interface{}) { fmt.Fprintf(writer, format, a...) }
func Println(a ...interface{})               { fmt.Fprintln(writer, a...) }