#!/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)
		#print l
		while(x>=n):
			#print 1
			x=x-c
		if(x<0):
			x=1
        	l[x-1]=1
        	l[0]=x
		for i in range(len(l)):
            		print l[i]