#include<iostream>
#include<vector>
#include<algorithm>
#include<cstring>
#include<cassert>
#include<cmath>
#include<ctime>
#include<iomanip>
#include<numeric>
#include<stack>
#include<queue>
#include<map>
#include<unordered_map>
#include<set>
#include<unordered_set>
#include<bitset>
#include<random>
#include<functional>
#include<utility>
using namespace std;
void solve()
{
	int N;
	long long X;
	cin >> N >> X;
	long long mn = (long long)N*(N+1)/2;
	if(X < mn) cout << -1 << endl;
	else
	{
		for(int i = 1;i <= N;i++)
		{
			if(i < N) cout << i;
			else cout << N + X-mn;
			cout << (i == N ? "\n":" ");
		}
	}
}
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int tt = 1;
	cin >> tt;
	while(tt--) solve();
}