#!/bin/python

import sys


q = int(raw_input().strip())
for a0 in xrange(q):
   	n,c = raw_input().strip().split(' ')
   	n,c = [int(n),int(c)]
	l=[]
	x=n*(n+1)//2
        
	if(x < c):
	        print -1
	elif(x==1 and c==0):
		print 1
	else:
		#for i in range(n):
		#	l.append(i+1)

		while(x>=n):
			x=x-c

		if(x<0):
			x=1
        	#l[x-1]=1
        	#l[0]=x
		#for i in range(len(l)):
            	#	print l[i]
        	for i in range(n):
			if(i==0):
				print x,
			elif(i==x-1):
				print 1,
			else:
				print i+1,
		print ''