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 testQ = in.nextInt();
        
        for (int testQI = 0; testQI < testQ; testQI++) {
            
        
        
            int n = in.nextInt();
            int k = in.nextInt();

            int []arr = new int[n + 1];

            for (int i = 1; i <= n; i++) {
                arr[i] = 1;
            }

            ArrayList<Integer> list = new ArrayList<>();
            ArrayList<Integer> newList = new ArrayList<>();

            int currentN = n - 1;

            while (currentN > 0) {
                if (k - currentN >= 0) {
                    k -= currentN;
                    list.add(currentN);
                }
                currentN--;
            }



            if (k > 0) {
                System.out.println(-1);
            } else {
                if (list.size() > 0) {
                    int last = list.get(0);
                    for (int w = list.size() - 1; w >= 1; --w) {
                        last = list.get(w) + 1;
                        //System.out.println(list.get(w) + 1);
                        newList.add(list.get(w) + 1);

                    }
                    //System.out.println(last + 1);
                    newList.add(last + 1);

                    for (int w = newList.size() - 1; w >= 0; --w) {
                        System.out.print(newList.get(w) + " ");
                        arr[newList.get(w)] = 0;
                    }
                }

                for (int w = 1; w <= n; w++) {
                    if (arr[w] == 1) {
                        System.out.print(w + " ");
                    }
                }
                System.out.println();
            }
        
        }
        
    }
}