#!/bin/python

import sys


def lena_array(length, comparisons):
    if length <= 1:
        return [1]
    else:
        # calculate min com for len
        if comparisons < length - 1:
            return [-1]
        else:
            max = (length - 1) * 2
            if comparisons == max:
                return [i for i in range(length, 0, -1)]
            elif comparisons > max:
                return [-1]
            else:
                pivot = 1
                less = []
                more = []
                for i in range(2, comparisons+1):
                    if len(less) > len(more):
                        more.append(i)
                    else:
                        less.append(i)
                    if i == length:
                        break

                less.sort(reverse=True)
                ans = list()
                ans.extend(less)
                ans.append(pivot)
                ans.extend(more)
                if len(ans) < length:
                    last = len(ans) + 1
                    ans.extend([i for i in range(last, length+1)])
                return ans

q = int(raw_input().strip())
for a0 in xrange(q):
    length, c = raw_input().strip().split(' ')
    length, c = [int(length), int(c)]
    # your code goes here
    print ' '.join(str(i) for i in lena_array(length, c))