T = int(input())
for _ in range(T):
    N, X = map(int, input().split())
    min_sum = (1 + N) * N // 2
    if min_sum <= X:
        ans = [i for i in range(1, N + 1)]
        ans[-1] = X - min_sum + N
        print(" ".join(map(str, ans)))
    else:
        print(-1)