#include <stdio.h>
#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000300

int main(){	

	int T;
	cin>>T;
	
	rep(_,T){
		long long A,B;
		cin>>A>>B;
		vector<long long> X;
		for(long long i=0;i<=60;i++){
			if((A>>i)&1){
				if((A + (1LL<<i)) <= B){
					X.push_back(1LL<<i);
					A += 1LL<<i;
				}
			}
		}
		
		for(int i=60;i>=0;i--){
			if((A + (1LL<<i)) <= B){
				X.push_back(1LL<<i);
				A += 1LL<<i;
			}
		}
		
		cout<<X.size()<<endl;
		rep(i,X.size()){
			if(i!=0)cout<<' ';
			cout<<X[i];
		}
		cout<<endl;
	}
	
    return 0;
}