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

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
			System.out.println(getArrays(len, c));
		}
	}

	private static String getArrays(int len, int c) {
		if (c > len*len) {
			return "-1";
		}

		for (int i = 0; i < len; i++) {
			List<Integer> arr = new ArrayList<Integer>();
			for (int j = 0; j < len; j++) {
				int k = ((j + i) % len) + 1;
				arr.add(k);
			}

			int comp = checkForComparisons(arr, 0, c);
			if (comp == c) {
				return String.join(" ", arr.stream().map(String::valueOf)
						.collect(Collectors.toList()));
			}
		}
		return "-1";
	}

	private static int checkForComparisons(List<Integer> arr, int comp, int c) {
		if (comp > c) {
			return -1;
		}
		if (arr.size() <= 1) {
			return comp;
		}

		int pivot = arr.get(0);
		List<Integer> less = new ArrayList<Integer>();
		List<Integer> more = new ArrayList<Integer>();

		for (int i = 1; i < arr.size(); ++i) {
			// Comparison
			if (arr.get(i) < pivot) {
				less.add(arr.get(i));
			} else {
				more.add(arr.get(i));
			}
			comp++;
		}

		return checkForComparisons(less, 0, c-comp) + comp
				+ checkForComparisons(more, 0, c-comp);
	}
}