using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static long[] NList => ReadLine().Split().Select(long.Parse).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var t = NN;
        var ans = new string[t * 2];
        for (var u = 0; u < t; ++u)
        {
            var c = NList;
            var (a, b) = (c[0], c[1]);
            var list = Add(a, b);
            ans[u * 2] = list.Count.ToString();
            ans[u * 2 + 1] = string.Join(" ", list);
        }
        WriteLine(string.Join("\n", ans));
    }
    static List<long> Add(long a, long b)
    {
        var al = Divide(a);
        var bl = Divide(b);
        var bpos = 0;
        var list = new List<long>();
        if (al.Count < bl.Count)
        {
            bpos = bl.Count - 1;
        }
        else
        {
            for (var i = al.Count - 1; i >= 0; --i)
            {
                if (al[i] == 0 && bl[i] == 1)
                {
                    bpos = i;
                    break;
                }
            }
        }
        for (var i = 0; i < bpos; ++i)
        {
            if (al[i] == 1)
            {
                var tpos = i;
                list.Add(1L << i);
                while (true)
                {
                    al[tpos] = 0;
                    ++tpos;
                    if (al.Count == tpos)
                    {
                        al.Add(1);
                        break;
                    }
                    if (al[tpos] == 0)
                    {
                        al[tpos] = 1;
                        break;
                    }
                }
            }
        }
        for (var i = bpos; i >= 0; --i)
        {
            if (al[i] == 0 && bl[i] == 1)
            {
                list.Add(1L << i);
            }
        }
        return list;
    }
    static List<long> Divide(long a)
    {
        var ans = new List<long>();
        while (a > 0)
        {
            ans.Add(a % 2);
            a >>= 1;
        }
        return ans;
    }
}