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

using Int = long long;
const char newl = '\n';

template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}
template<typename T> void drop(const T &x){cout<<x<<endl;exit(0);}
template<typename T=Int>
vector<T> read(size_t n){
  vector<T> ts(n);
  for(size_t i=0;i<n;i++) cin>>ts[i];
  return ts;
}

//INSERT ABOVE HERE

signed solve(){
  Int a,b;
  cin>>a>>b;
  vector<Int> ans;
  Int k;
  for(k=1;a+k<=b;k<<=1){
    if(a&k) ans.emplace_back(k),a+=k;
  }
  for(;k;k>>=1){
    if(b&k&~a) ans.emplace_back(k),a+=k;
  }
  assert(a==b);
  cout<<ans.size()<<newl;
  int fst=1;
  for(Int x:ans){
    if(!exchange(fst,0)) cout<<' ';
    cout<<x;
  }
  cout<<newl;
  return 0;
}

signed main(){
  cin.tie(0);
  ios::sync_with_stdio(0);

  Int T;
  cin>>T;
  while(T--) solve();
  return 0;
}