// #pragma GCC optimize("Ofast")
// #pragma GCC target("avx2,bmi,bmi2,lzcnt")
// #define NDEBUG

#include <bits/extc++.h>
#include <x86intrin.h>

struct rep {
  struct iter {
    int i;
    constexpr void operator++() { ++i; }
    constexpr int operator*() const { return i; }
    friend constexpr bool operator!=(iter a, iter b) { return *a != *b; }
  };
  const int l, r;
  constexpr rep(int _l, int _r) : l(std::min(_l, _r)), r(_r) {}
  constexpr rep(int n) : rep(0, n) {}
  constexpr iter begin() const { return {l}; }
  constexpr iter end() const { return {r}; }
};
struct per {
  struct iter {
    int i;
    constexpr void operator++() { --i; }
    constexpr int operator*() const { return i; }
    friend constexpr bool operator!=(iter a, iter b) { return *a != *b; }
  };
  const int l, r;
  constexpr per(int _l, int _r) : l(std::min(_l, _r)), r(_r) {}
  constexpr per(int n) : per(0, n) {}
  constexpr iter begin() const { return {r - 1}; }
  constexpr iter end() const { return {l - 1}; }
};
template <class T, class U>
constexpr bool chmin(T& a, U&& b) {
  return b < a ? a = std::forward<U>(b), true : false;
}
template <class T, class U>
constexpr bool chmax(T& a, U&& b) {
  return a < b ? a = std::forward<U>(b), true : false;
}

int main() {
  using namespace std;
  cin.tie(nullptr)->sync_with_stdio(false);
  int tt;
  cin >> tt;
  while (tt--) {
    int64_t a, b;
    cin >> a >> b;
    int d = __lg(a ^ b);
    if (a % (int64_t(1) << (d + 1)) == 0) d = __builtin_ctz(a);
    vector<int64_t> ans;
    for (int s : rep(d))
      if (a >> s & 1) {
        ans.push_back(int64_t(1) << s);
        a += ans.back();
      }
    for (int s : per(d))
      if (b >> s & 1) ans.push_back(int64_t(1) << s);
    cout << size(ans) << '\n';
    for (int i : rep(size(ans)))
      cout << ans[i] << " \n"[i == int(size(ans)) - 1];
  }
}