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(Math.abs(Math.sqrt(1+8*c) - Math.floor(Math.sqrt(1+8*c))) <= 0.000001){
                System.out.print(1);
                for(int i = 2;i <= len;i++){
                    System.out.print(" " + i);
                }
                System.out.println();
            }
            else{
                System.out.println(-1);
            }
        }
    }
}