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 sc = new Scanner(System.in);
		int q = sc.nextInt();
		
		while(q -- > 0) {
			
			int n = sc.nextInt();
			int c = sc.nextInt();
			
			if(c > (n *(n-1))/2) {
				System.out.println(-1);
			}else if(n == 1) {
				System.out.println(1);
			}else {
				
				StringBuilder sb = new StringBuilder();
				for(int i= 1; i<= n ;i++) {
					sb.append(i);
				}
				
				int j = 0;
				n = n-1;
				while(c > 0) {
					
					
					if(c >= n) {

						sb.deleteCharAt(n-1+j);
						sb.insert(j, n);
						j++;
						c = c-n;
						//System.out.println(c);
					}
					n--;
				}
				
				for(int i= 0; i< sb.length(); i++) {
					System.out.print(sb.charAt(i)+" ");
				}
                System.out.println();
			}
			
		}
	}

}