#include <bits/stdc++.h>
using namespace std;

int main()
{
    int T;
    cin >> T;
    for (int i = 0; i < T; i++)
    {
        long long N, X;
        cin >> N >> X;
        long long sum = (N * N + N) / 2;
        if (X - sum < 0)
        {
            cout << -1 << "\n";
        }
        else
        {
            for (int j = 1; j < N; j++)
            {
                cout << j << " ";
            }
            cout << N + (X - sum) << "\n";
        }
    }
}