class List<A>
{
 A a;
}

class Objekt
{
}

class AbstractList<A> { A a; }
class Vektor<A> extends AbstractList<A> { A a; }
class Matrix<A> extends Vektor<Vektor<A>> { A a; }
class ExtMatrix<A> extends Matrix<A> { A a; }

class otth19
{
}