@Override
	public String toString() {
		String sz = "Z[";
		String sy = "Y[";
		for (E e : controleZ)
			sz += e.toString() + ", ";

		for (E e : controleY)
			sy += e.toString() + ", ";

		if (sz.length() > 2)
			sz = sz.substring(0, sz.length() - 2);

		if (sy.length() > 2)
			sy = sy.substring(0, sy.length() - 2);

		return sz + "]\n" + sy + "]";
	}