#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
signed main() {
  auto solve = [&] () {
    vector<long long> ans;
    long long a, b;
    cin >> a >> b;
    for (int i = 0; i < 60; i++) {
      long long x = 1LL << i;
      long long y = 1LL << (i + 1);
      if (a % y != 0 && (a + x) <= b) {
        a += x;
        ans.push_back(x);
      }
    }
    for (int i = 59; i >= 0; i--) {
      long long x = 1LL << i;
      if (a + x <= b) {
        a += x;
        ans.push_back(x);
      }
    }
    assert(a == b);
    cout << ans.size() << '\n';
    for (int i = 0; i < (int) ans.size(); i++) {
      if (i > 0) cout << " ";
      cout << ans[i];
    }
    cout << '\n';
  };
  int t;
  cin >> t;
  while (t--) solve();
  return 0;
}