#include <bits/stdc++.h>
#define INF 1000000001
#define MOD 1000000007
#define long long long
#define all(x) x.begin(),x.end()
using namespace std;

int main()
{
	ios_base::sync_with_stdio(0); 
    cin.tie(0);
	
	int t;
	cin >> t;

	while(t--)
	{
		long a,b;
		cin >> a >> b;

		int mx = -1;
		for(int i = 59; i>=0; i--)
		{
			if((b&(1LL<<i)) > (a&(1LL<<i)))
			{
				mx = i;
				break;
			}
		}
		vector<long> res;
		for(int i = 0; i<mx; i++)
		{
			if(a&(1LL<<i))
			{
				res.push_back(1LL<<i);
				a+=1LL<<i;
			}
		}
		for(int i = 59; i>=0; i--)
		{
			if((b&(1LL<<i)) > (a&(1LL<<i)))
			{
				res.push_back(1LL<<i);
				a+=(1LL<<i);
			}
		}
		cout << res.size() << "\n";
		for(int i = 0; i<res.size(); i++)
			cout << res[i] << " ";
		cout << "\n";
	}
	
    return 0;
}