#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
//using namespace atcoder;
using ll = long long;
using ull = unsigned long long;
using i128 = __int128_t;
using u128 = unsigned __int128_t;
using mint = atcoder::static_modint<998244353>;
const int mod = 998244353;
#include <chrono>
mt19937_64 rng(std::chrono::steady_clock::now().time_since_epoch().count());
int dx[8] = {-1, 1, 0, 0, -1, -1, 1, 1};
int dy[8] = {0, 0, -1, 1, -1, 1, -1, 1};
template<class T>
bool chmin(T& a, const T& b){
    if (b < a){
        a = b;
        return true;
    }
    else { 
        return false;
    }
}
template<class T> 
bool chmax(T& a, const T& b){
    if (a < b){
        a = b;
        return true;
    }
    else {
        return false;
    }
}

void solve(){
    ll a, b;
    cin >> a >> b;
    int idx = 0;
    for (int i = 60; i >= 0; i--){
        if ((b >> i) & 1){
            idx = i;
            break;
        }
    }
    vector<ll> ans;
    for (int i = 0; i <= 60; i++){
        if ((a >> i) & 1){
            if (a + (1LL << i) <= b){
                ans.push_back(1LL << i);
                a += (1LL << i);
            }
        }
    }
    while(a != b){
        for (int i = 60; i >= 0; i--){
            if (a + (1LL << i) <= b){
                ans.push_back(1LL << i);
                a += (1LL << i);
            }
        }
    }
    cout << (int)ans.size() << '\n';
    for (auto d : ans){
        cout << d << ' '; 
    }
    cout << '\n';
};

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int t;
    cin >> t;  
    while(t--){
        cout << fixed << setprecision(15);          
        solve();
    }   
}