#include <iostream>
#include <vector>

using lint = long long;

void solve() {
    lint x, y;
    std::cin >> x >> y;

    std::vector<lint> ans;
    while (x != y) {
        int r = 60;
        while (true) {
            if (((y >> r) & 1) && ((~x >> r) & 1)) break;
            --r;
        }

        int l;
        for (l = 0; l < r; ++l) {
            if ((x >> l) & 1) break;
        }

        ans.push_back(1LL << l);
        x += (1LL << l);
    }

    std::cout << ans.size() << "\n";
    for (auto a : ans) std::cout << a << " ";
    std::cout << "\n";
}

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

    int q;
    std::cin >> q;
    while (q--) solve();

    return 0;
}