t=int(input())
for i in range(t):
	n,x=map(int,input().split())
	if n*(n+1)/2>x:
		print(-1)
	else:
		anslist=[]
		for j in range(1,n-1):
			anslist.append(j)
		anslist.append(x-n*(n-1)/2)
		print(*anslist)