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();
            // your code goes here
            int most = 0;
            for (int i = len - 1; i > 0; i--){
                most = most + i;
            }
            int least = 0;
            int lenTemp = len - 1;
            while (lenTemp > 0){
                least = least + lenTemp;
                lenTemp = lenTemp - 2;
            }
            if (c > most){
                System.out.println(-1);
            }else if (c < least){
                System.out.println(-1);
            }else{
                if (c == most){
                    for (int i = 0; i < len; i++){
                        System.out.print(i + 1 + " ");
                    }
                    System.out.println();
                }else if (c == least){
                    if(len % 2 == 0){
                        for (int i = len; i > 0; i = i - 2){
                            System.out.print(i + " ");
                        }
                        for (int i = 2; i <= len; i = i + 2){
                            System.out.print(i + " ");
                        }
                        System.out.println();
                    }else{
                        for (int i = len - 1; i > 0; i = i-2){
                            System.out.print(i + " ");
                        }
                        for (int i = 1; i <= len; i = i + 2){
                            System.out.print(i + " ");
                        }
                        System.out.println();
                    }
                }else{
                    System.out.println("blah");
                }
                /*int[] arr = CreateArray(len, c);
                for (int i = 0; i < arr.length; i++){
                    System.out.println(arr[i]);
                }*/
            }
        }
    }
    
    /*public int[] CreateArray(int len, int c){
        
    }*/
}