import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int q = in.nextInt();
        for(int a0 = 0; a0 < q; a0++){
            int len = in.nextInt();
            int c = in.nextInt();
            // your code goes here
            int m=(len*(len-1))/2;
            if(m<c||c<(len-1))
                System.out.println(-1);
            else           
            {
               int a[]= comp(len,c,0);
                for(int i=0;i<len;i++)
                    System.out.print(a[i]+" ");
                System.out.println();
            }
        }
    }
   static int[] comp(int n,int c,int p)
        {
        int a[]=new int [n];
        int y=(n*(n-1))/2;
        
        if(y==c)
                {
                for(int i=n;i>=1;i--)
                    a[n-i]=i;
            return a;
        }
        c-=(n-1);
       
       if(n>1)
       { a[0]=n-1;
           int b[]=comp(n-1,c,0);
        
        for(int i=1;i<n-1;i++)
            a[i]=b[i-1];      
       }
        a[n-1]=n;
       return a;
    }
}