#!/bin/python3

import sys
import random

count = 0

def pivotless(A,pivot,count):
	x = 9223372036854775807
	lessum = list()
	if len(A) > 1:
		for i in range(0,len(A)):
			if A[i] < pivot:
				lessum.append(A[i])
				count = count+1
	return lessum,count

def pivotmore(B,pivot,count):
	x = 0
	moreum = list()
	if len(B) > 1:
		for i in range(0,len(B)):
			if B[i] > pivot:
				moreum.append(B[i])
				count = count+1
	return moreum,count

def lena_sort(nums,count):
    if len(nums)<=1:
        return nums,count

    pivot = nums[0]

    less,count = pivotless(nums,pivot,count)
    more,count = pivotmore(nums,pivot,count)

    # less = list()
    # more = list()

    # for _ in range(0,len(nums)):
    #     if (nums[_] < pivot):
    #         less.append(nums[_])
    #         count = count+1 
    #     else:
    #         more.append(nums[_])
    #         count = count+1

    sorted_less,count = lena_sort(less,count)
    sorted_more,count = lena_sort(more,count)

    ans = sorted_less
    ans.append(pivot)
    ans = ans+sorted_more
     # + pivot + sorted_more
    # print(count)
    return ans,count

q = int(input().strip())
for a0 in range(q):
    lens,c = input().strip().split(' ')
    lens,c = [int(lens),int(c)]
    
    # count = 0
    # temp = random.sample(range(c+1), c+1)
    # temp.remove(0)
    # print(lena_sort(temp,count))
    temp2 = [4,2,1,3,5]
    # print(lena_sort(temp2,count))
    a = lena_sort(temp2,count)
    # 
    # print(pivotmore(temp2,4))
    done = 0

    for als in range(0,lens):
    	count = 0
    	temp = random.sample(range(lens+1), lens+1)
    	temp.remove(0)
    	# print(temp)
    	a,a2 = lena_sort(temp,count)
    	# print(a2)
    	if a2 is c:
    		# print(temp)
    		for item in temp:
    			print(item,end=" ")
    		done = 1
    		print("")
    		break
    if done is 0:
    	print(-1)
    	print("")