def solve(n, x):
	head_sum = (n - 1) * n // 2
	last = x - head_sum
	if last < n:
		return [-1]
	else:
		ans = list(range(1, n + 1))
		ans[-1] = last
		return ans

t = int(input())
for _ in range(t):
	n, t = [int(x) for x in input().split()]
	print(*solve(n, t))