def sigma(num):
    return num * (num + 1) // 2


def solve():
    N, X = map(int, input().split())
    if sigma(N) > X:
        print(-1)
    else:
        ans = list(range(1, N))
        ans.append(X - sigma(N-1))
        print(*ans)


T = int(input())
for _ in range(T):
    solve()