#include "bits/stdc++.h"

//#include <atcoder/all>

using namespace std;
//using namespace atcoder;

//#define int long long
#define ll long long

ll INF = (1LL << 60);
int mod = 100000;
using P = pair<int, int>;


signed main() {
	int T; cin >> T;
	for (int _ = 0; _ < T; _++) {
		ll A, B; cin >> A >> B;
		vector<ll>ans;
		for (ll i = 0; i < 60; i++) {
			if (A % (1LL << (i + 1)) == 0)continue;
			if (A + (1LL << i) <= B) {
				A += (1LL << i);
				ans.push_back(1LL << i);
			}
		}
		for (ll i = 59; i >= 0; i--) {
			if (A + (1LL << i) <= B) {
				A += (1LL << i);
				ans.push_back(1LL << i);
			}
		}
		cout << ans.size() << endl;
		for (auto x : ans) {
			cout << x << " ";
		}
		cout << endl;
		
	}
	return 0;
}