#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define ALL(v) v.begin(),v.end()
typedef long long ll;

#include <bits/stdc++.h>
using namespace std;

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