30 Keyword Optimized Articles for Webcont247365.

I need 30 articles written about two topics in the health industry. Interested bidder should know how to write keyword optimized articles. I will pay $3 an article. Each article needs to be optimized for a different keyword, have a keyword density of 2 to 4 % and a word count of 500 to 600 words. I'll supply the topic and keywords. All articles will become my property upon payment and may not be redistributed. Articles are to be supplied in txt or doc format and should be unique (not second generation copies).