class JoggingShoes_ColorBase extends Shoes_Base {};
class JoggingShoes_Black extends JoggingShoes_ColorBase {};
class JoggingShoes_Blue extends JoggingShoes_ColorBase {};
class JoggingShoes_Red extends JoggingShoes_ColorBase {};
class JoggingShoes_Violet extends JoggingShoes_ColorBase {};
class JoggingShoes_White extends JoggingShoes_ColorBase {};