#include<iostream>
#include<stdio.h>
#include<stdlib.h>
#include<algorithm>
#include<vector>
#include<string.h>
#include<math.h>
#include<map>
#include<iomanip>
#include<queue>

using namespace std;

int main(){
	int t;
	cin >> t;
	while(t--){
		unsigned long long a , b;
		cin >> a >> b;
		vector<unsigned long long> ans;
		for(unsigned long long i = 1; i <= 60; i++){
			if((a & (unsigned long long)(1 << i)) != 0 && (b & (unsigned long long)(1 << i)) == 0){
				ans.push_back((unsigned long long)(1 << i));
				a += (unsigned long long)(1 << i);
			}
		}
		for(unsigned long long i = 60; i >= 1; i--){
			if((a & (unsigned long long)(1 << i)) == 0 && (b & (unsigned long long)(1 << i)) != 0){
				ans.push_back((unsigned long long)(1 << i));
				a += (unsigned long long)(1 << i);
			}
		}
		cout << ans.size() << endl;
		for(int i = 0; i < ans.size(); i++){
			cout << ans[i] << " ";
		}
		cout << endl;
	}
	return 0;
}