#include <bits/stdc++.h>
using namespace std;
int main(){
  int T;
  cin >> T;
  for (int i = 0; i < T; i++){
    long long A, B;
    cin >> A >> B;
    vector<long long> ans;
    for (int j = 0; j < 60; j++){
      if (A >> j & 1){
        if (A + ((long long) 1 << j) <= B){
          ans.push_back((long long) 1 << j);
          A += (long long) 1 << j;
        }
      }
    }
    for (int j = 59; j >= 0; j--){
      if (!(A >> j & 1) && (B >> j & 1)){
        ans.push_back((long long) 1 << j);
        A += (long long) 1 << j;
      }
    }
    int K = ans.size();
    cout << K << endl;
    for (int j = 0; j < K; j++){
      cout << ans[j] << ' ';
      if (j < K - 1){
        cout << ' ';
      }
    }
    cout << endl;
  }
}