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*(len+1))/2) &&c<(len-1)){
                System.out.println("-1");
            }
            else if(c==(len-1)){for(int i=1;i<=len;i++){System.out.print(i+" ");
                                                       }System.out.println();}
          
        }
    }
}