T=int(input())
for _ in range(T):
	n,x=map(int,input().split())
	if n*(n+1)//2>x:
		print(-1)
		continue
	ok=10**10
	ng=n-1
	while ok-ng>1:
		m=(ok+ng)//2
		if m*(m+1)//2>=x:
			ok=m
		else:
			ng=m
	a=[ok-i for i in range(n)]
	for i in range(ok*(ok+1)//2-x):
		a[~i]-=1
	print(*a)