q=int(raw_input())
def z(l,c):
	try:
		z=(l*l-4*c)**0.5
	except:
		return 0
	if round(z)==z:
		return 1
	return 0

def p(a):
	for i in a:
		print i,
	return 0

for i in range(q):
	l,c=[int(x) for x in raw_input().split()]
	if l*(l-1)==2*c:
		for j in range(l):
			print j+1,
	elif z(l,c)==1:
		a=[1]
		for k in range(2,l+1):
			if k%2==0:
				a.insert(0,k)
			else:
				a.append(k)
		p(a)
	else:
		print -1