#!/bin/python3

import sys

def lena_sort(array,c):
    if len(array)<2 or c==0:
        return array
    pivot = array[0]
    less=[]
    more=[]
    for a0 in range(1,len(array)):
        if c==0:
            break
        if array[a0]<pivot:
            c=c-1
            less.append(array[a0])
        else:
            more.append(array[a0])
    sorted_less=lena_sort(less,c)
    sorted_more=lena_sort(more,c)
    return sorted_more+sorted_less+[pivot]

q = int(input().strip())
for a0 in range(q):
    len1,c = input().strip().split(' ')
    len1,c = [int(len1),int(c)]
    # your code goes here
    maxcomp=len1*(len1-1)/2
    if c > maxcomp:
        print(-1)
    else:
        array=[]
        for a0 in range(len1):
            array.append(len1-a0)
        if c < maxcomp:
            array = lena_sort(array,c)
        for x in array:
                print(x,end=' ')
    print(end='\n')