using System.Linq;
using System;

public class Hello
{
    static void Main()
    {
        var T = int.Parse(Console.ReadLine().Trim());
        while (T-- > 0)
        {
            string[] line = Console.ReadLine().Trim().Split(' ');
            var n = long.Parse(line[0]);
            var x = long.Parse(line[1]);
            getAns(n, x);
        }
    }
    static void getAns(long n, long x)
    {
        var sn = n * (n + 1) / 2;
        if (sn > x) { Console.WriteLine(-1); return; }
        if (sn == x) Console.WriteLine(string.Join(" ", Enumerable.Range(1, (int)n)));
        else
        {
            var sn1 = n * (n - 1) / 2;
            Console.Write(string.Join(" ", Enumerable.Range(1, (int)n - 1)));
            Console.WriteLine(" {0}", x - sn1);
        }
    }
}