#include <cassert>
#include <iostream>
#include <vector>
using namespace std;
using ll = long long;
int main() {
	int tt;
	cin >> tt;
	const int M = 60;
	for(;tt--;) {
		ll A, B;
		cin >> A >> B;
		vector<ll> ans;
		for(int i = 0; i < M; i++) {
			if(A >> i & 1 && A + (1LL<<i) <= B) {
				A += 1LL<<i;
				ans.push_back(1LL<<i);
			}
		}
		for(int i = M; i--; ) {
			if((A >> i & 1) == 0 && A + (1LL<<i) <= B){
				assert(A % (1LL<<i) == 0);
				ans.push_back(1LL<<i);
				A += 1LL<<i;
			}
		}
		cout << ans.size() << '\n';
		for(int i = 0; i < ans.size(); i++) cout << ans[i] << " \n"[i == ans.size() - 1];
	}
}