T=int(input())
for t in range(T):
	N,X=map(int,input().split())
	ans_lst=[i for i in range(1,N)]
	ans_lst.append(X-sum(ans_lst))
	if N>=2 and ans_lst[-2]>=ans_lst[-1]:
		print(-1)
	else:
		print(*ans_lst)