#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return true; } return false; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return true; } return false; }
#define all(x) (x).begin(),(x).end()
#define fi first
#define se second
#define mp make_pair
#define si(x) int(x.size())
const int mod=1000000007,MAX=200005;
const ll INF=1LL<<60;

int main(){
    
    std::ifstream in("text.txt");
    std::cin.rdbuf(in.rdbuf());
    cin.tie(0);
    ios::sync_with_stdio(false);
    
    int Q;cin>>Q;
    while(Q--){
        ll a,b;cin>>a>>b;
        vector<ll> res;
        
        for(int i=0;i<62;i++){
            if(a+(1LL<<i)>b) break;
            if(a&(1LL<<i)){
                res.push_back(1LL<<i);
                a+=(1LL<<i);
            }
        }
        
        for(int i=61;i>=0;i--){
            if(b-a>=(1LL<<i)){
                res.push_back(1LL<<i);
                a+=(1LL<<i);
            }
        }
        
        cout<<si(res)<<endl;
        for(auto x:res) cout<<x<<" ";
        cout<<endl;
    }
}