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();
            int l  = len * len ;
            if(l >= c )
                {
                for(int i = len-1 ;i>= 0 ;i-- )
                    {
                    if(i!=0)
                    System.out.print(i+" ");
                    else
                         System.out.print(len +1 );
                }
            }
            else
                {
                 System.out.print(-1);
            }
             System.out.println();
        }
    }
}