youtube davejones/ruby II -  class inheritance
youtube davejones/ruby II -  class inheritance
youtube davejones/ruby II -  class inheritance
youtube davejones/ruby II -  class inheritance
youtube davejones/ruby II -  class inheritance
youtube davejones/ruby II -  class inheritance
youtube davejones/ruby II -  class inheritance
youtube davejones/ruby II -  class inheritance
youtube davejones/ruby II -  class inheritance, # get zebras with more than 50 stripes