Ruby. Gugudan

class Gugu
  def print_all
    (2...9).each do |dan|
      print_dan(dan)
    end
  end

  def print_dan(dan)
    puts "#{dan} dan" % [dan]
    (1...9).each do |element|
      puts "#{dan} * #{element} = #{dan * element}"
    end
  end
end

gugu = Gugu.new
gugu.print_all
gugu.print_dan(11)