#include<bits/stdc++.h>
using namespace std;
int main()
{
    int tt;
    cin >> tt;
    while(tt--)
    {
        long long a,b;
        cin >> a >> b;
        long long sum = a;
        int cnt = 0;
        vector<long long >ans;
        while(sum<b)
        {
            long long left = b - sum;
            long long add = 0;
            if(left == 1)
            {
                add = 1;
            }
            else if(left < sum)
            {
                long long aa = sum;
                while(aa>left)
                {
                    aa /= 2;
                }
                add = aa;
            } else add = sum;
            //cout << add << " ";
            sum += add;
            //cout << sum << endl;
            cnt ++;
            ans.push_back(add);
        }
        cout << cnt << endl;
        for(long long x : ans)cout << x << " ";
        cout << endl;
    }
}