using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var t = NN;
        var ans = new List<string>();
        for (var u = 0; u < t; ++u)
        {
            var c = ReadLine().Split();
            var n = int.Parse(c[0]);
            var x = long.Parse(c[1]);
            var min = new long[n];
            for (var i = 0; i < n; ++i) min[i] = i + 1;
            var sum = min.Sum();
            if (x < sum)
            {
                ans.Add("-1");
            }
            else
            {
                min[^1] += x - sum;
                ans.Add(string.Join(" ", min));
            }
        }
        WriteLine(string.Join("\n", ans));
    }
}