using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
class Solution {

    static void Main(String[] args) {
        int q = Convert.ToInt32(Console.ReadLine());
        for(int a0 = 0; a0 < q; a0++){
            string[] tokens_len = Console.ReadLine().Split(' ');
            int len = Convert.ToInt32(tokens_len[0]); //length of array
            int c = Convert.ToInt32(tokens_len[1]); //number of comparisons
            
            int[] ans = Lena(len, c);
            Console.WriteLine(string.Join(" ", ans));
        }
    }
    
    static int[] Lena(int len, int c){
        int[] ans = Populate(len);
        
        //trivial cases
        if(c == 0){  
            return ans;
        }    
        if(c % len == 0){
            return new int[] { -1 };
        }
        //do bubble sort
        int index = 0;
        for(int i = 0; i < c; i++){
            int nextIndex = (index + 1) % len; 
            int temp = ans[nextIndex];
            ans[nextIndex] = ans[index];
            ans[index] = temp;
            index = nextIndex;
        }
        
        return ans;
    }
    
    //populate array in sorted order
    static int[] Populate(int len){
        int[] ans = new int[len];   
        for(int i = 0; i < len; i++){
            ans[i] = i+1;
        }  
        return ans;
    }
    
    
}