#include<bits/stdc++.h>
using namespace std;
using LL = long long;
using ULL = unsigned long long;
#define rep(i,n) for(int i=0; i<(n); i++)

int main() {
    int T; cin >> T;
    while (T--) {
        ULL A, B; cin >> A >> B;
        vector<ULL> ans;
        rep(i, 60) if (A & (1ull << i)) if (A + (1ull << i) <= B) { ans.push_back(1ull << i); A += (1ull << i); }
        for (int i = 59; i >= 0; i--) if (A + (1ull << i) <= B) { ans.push_back(1ull << i); A += (1ull << i); }
        cout << ans.size() << endl;
        rep(i, ans.size()) { if (i) cout << " "; cout << ans[i]; } cout << endl;
    }

    return 0;
}