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();
            if(c/len>10)
                {
                System.out.println(-1);
                break;
            }
            // your code goes here
            int arr[] = new int[len];
            int i,t,x=1;
             t=(int)(len-1)/2;
            if(len%2!=0)
                {
                for(i=0;i<len;i++)
                    {
                    arr[t]=i+1;
                    if(x%2!=0)
                        t=t-x;
                    else
                        t=t+x;
                    x=x+1;
                }
            }
            else
                {
                for(i=0;i<len;i++)
                    arr[len-1-i]=i+1;  
            }
            for(i=0;i<len;i++)
                System.out.print(arr[i]+" ");
            System.out.println();
        }
    }
}