#include <bits/stdc++.h>

using namespace std;

using ll = long long;

constexpr char newl = '\n';

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    int t;
    cin >> t;

    for (int i = 0; i < t; i++) {
        ll a, b;
        cin >> a >> b;

        vector<ll> ans;
        while (true) {
            if ((a << 1) > b) break;
            ans.push_back(a);
            a <<= 1;
            if (a == b) break;
        }

        for (int j = 59; j >= 0; ) {
            if (!(b >> j & 1)) {
                --j;
                continue;
            }

            if (a >> j & 1) {
                --j;
                continue;
            }

            ll nex = min((a & -a), 1LL << j);
            ans.push_back(nex);
            a += nex;
        }

        cout << ans.size() << newl;
        for (int i = 0; i < ans.size(); i++) {
            cout << ans[i] << " \n"[i + 1 == ans.size()];
        }
    }    

    return 0;
}