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();
        int i,j,k;
        
        
        for(int a0 = 0; a0 < q; a0++)
        
        {
            long sum=0L;
            int len = in.nextInt();
            int c = in.nextInt();
        
            int A[]=new int[len];
            
             sum= ((len-1)*(len))/2;
                
            if(c==sum)
            {
            for(i=len;i>=1;i--)
            {
                System.out.print(i+" ");
                
            }
               System.out.println();
            }
            else if(c>sum)
            {
                System.out.println("-1");
            }
            
            
        }
        
        
        
        
    }
}