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();
            long steps = (long)c;
            long num = (len*(len - 1))/2;
            if(len == 1){
                System.out.println(len);
                return;
            }
            if(steps == num){
                for(int i = c; i >=1; i--){
                    System.out.print(i + " ");
                }
                System.out.println();
            }else if(steps < len - 1){
                System.out.println(-1);
            }else{
                System.out.println(-1);
            }
            // your code goes here
        }
    }
}