#include <bits/stdc++.h>
using namespace std;
int t, m, k, x, d, flag;
vector<int> a, b;

int main()
{
	freopen("Sequence.in", "r", stdin);
	freopen("Sequence.out", "w", stdout);
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin >> t;
	while (t--)
	{
		a.clear();
		b.clear();
		cin >> m >> k;
		x = 0;
		for (int i = 0; i < 5; i++)
		{
			if (k & (1 << i))
			{
				a.push_back((1 << (1 << i)) - 1);
				x += a.back();
			}
		}
		flag = 0;
		if (m - x < 0)
			flag = 1;
		else if (m - x >= 2)
		{
			if (m - x % 2 == 0)
				b = {m - x / 2, m - x / 2};
			else
				b = {1, 2, (m - x - 3) / 2, (m - x - 3) / 2};
		}
		else if (m - x == 0) // 没剩
			b.clear();
		else if (a[0] == 1) // m-x==1
			a[0] = 2;		// 剩一个，换成2能加1（同时popcount不变），要不然无解
		else
			flag = 1;
		if (flag)
			cout << "-1\n";
		else
		{
			cout << a.size() + b.size() << endl;
			for (auto v : a)
				cout << v << " ";
			for (auto v : b)
				cout << v << " ";
			cout << endl;
		}
	}
	return 0;
}