def INT():
    return int(input())


def MI():
    return map(int, input().split())


def LI():
    return list(map(int, input().split()))


def INT():
    return int(input())


def MI():
    return map(int, input().split())


def LI():
    return list(map(int, input().split()))


T = INT()
for _ in range(T):
    N, X = MI()
    if N * (N + 1) // 2 > X:
        print(-1)
        continue

    A = []
    for i in range(N, 1, -1):
        A.append(i)
        X -= i

    A.append(X)

    A.sort(reverse=True)
    if A[0] == A[1] and N > 1:
        A[0] += 1
        A[-1] -= 1
    print(*A)