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 pk = len/2;
            int xy = pk * (pk+1);
            if(xy != c) {
                System.out.println(-1);
            }
            else {
                int[] array = new int[len];
                int bb = len-1;
                for(int i = 0; i < len/2; i++) {
                    array[i] = bb;
                    bb-=2;
                }
                int sk = 1;
                for(int i = len/2; i < len; i++) {
                    array[i] = sk;
                    sk+=2;
                }
                for(int i = 0; i < array.length; i++) {
                    System.out.print(array[i]+" ");
                }
                System.out.println();
            }
        }
    }
}