import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    static int c = 0;
    static List<Integer> lena_sort(List<Integer> nums) {
        if (nums.size() <= 1) {
            return nums;
        }
        int pivot = nums.get(0);
        List<Integer> less = new ArrayList<>();
        List<Integer> more = new ArrayList<>();
        for (int j = 1; j < nums.size(); ++j) {
            Integer i = nums.get(j);
            c++;
            // Comparison
            if (i < pivot)
                less.add(i);
            else
                more.add(i);
        }
        List<Integer> ans = lena_sort(less);
        ans.add(pivot);
        ans.addAll(lena_sort(more));
        return ans;
    }
    
    static StringBuilder sb = new StringBuilder(256000);

    static void test1(final int L, final int Ci) {
        long st = System.nanoTime();
        Random r = new Random();
        Set<Integer> set = new HashSet<Integer>(L);
        List<Integer> l2 = new ArrayList<>();
        do {
            set.clear();
            while (set.size() < L)
                set.add(r.nextInt(100));
            l2.clear();
            l2.addAll(set);
            Collections.shuffle(l2);
            c = 0;
            lena_sort(l2);
            if (System.nanoTime() - st > 3500000000L)
                break;
        } while (c != Ci);
        //System.out.println("c:" + c + "<>Ci:"+Ci);
        if (c != Ci) {
            System.out.println("-1");
        } else {
            sb.setLength(0);
            for (Integer inn : l2) {
                sb.append(inn);
                sb.append(' ');
            }
            sb.setLength(sb.length()-1);
            System.out.println(sb);
        }
        //System.out.println(L + ": "+ Collections.min(cs) + "-" + Collections.max(cs));
    }
    //                   1     3     5      7       9       11
    static int mins[] = {0, 1, 2, 4, 6, 8, 10, 13, 16, 19, 22};
    static int maxs[] = {0, 1, 3, 6, 10, 15, 21, 28, 36, 45, 55};
    
    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 (len <= mins.length) {
                if (c < mins[len - 1] || c > maxs[len - 1])
                    System.out.println("-1");
                else test1(len, c);
            } else if (c < (len * 2) || c > len * 5)
                System.out.println("-1");
            else test1(len, c);
                
            // your code goes here
        }
    }
}