:::::::::::::::::::::::::::::::::::::::::::::::::::::::

code

:::::::::::::::::::::::::::::::::::::::::::::::::::::: 



#!/usr/local/bin/ruby



class Top

end



class Middle < Top

end



class Bottom < Middle

end



class Up

  def cv(t)

    puts "Up"

  end

  def ctv(b)

    puts "Up"

  end

end



class Down < Up

  def cv(b)

    puts "Down"

  end

  def ctv(t)

    puts "Down"

  end

end



puts "First column"

Up.new.cv(Top.new)

Up.new.cv(Middle.new)

Up.new.cv(Bottom.new)

Up.new.cv(Top.new)

Up.new.cv(Middle.new)

Up.new.cv(Bottom.new)

puts "Second (and third) column"

Down.new.cv(Top.new)

Down.new.cv(Middle.new)

Down.new.cv(Bottom.new)

Down.new.cv(Top.new)

Down.new.cv(Middle.new)

Down.new.cv(Bottom.new)



:::::::::::::::::::::::::::::::::::::::::::::::::::::::

results

::::::::::::::::::::::::::::::::::::::::::::::::::::::



$ ruby cocon.rb

First column

Up

Up

Up

Up

Up

Up

Second (and third) column

Down

Down

Down

Down

Down

Down