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(1, N):
        A.append(i)
        X -= i
    if A[-1] == X:
        print(-1)
        continue

    A.append(X)
    print(*A)