Copy Writing

Hello I required 20 professionally written articles of approximately 600 words each. Requirements 1 - Grammatically correct American English 2 - Minimum 600 words each 3 - Please provide reference to previous work. 4 - Please be a native English speaker. 5 - Articles should be interesting to read, and are not just for SEO purposes. 6 - All copyrights will belong to me after the deal is done. I will use copyscape to check if the article is used elsewhere. 7 - Do not use the same paragraphs or same facts in multiple articles. 8 - All articles will be checked for plagiarism. Please DO NOT copy someone else's work. 9 - Keyword density should be more than 5% on the specific topic. 10 - All articles MUST be original. 11 - Articles will need to be well-researched. You will be provided with keywords or keyword phrases which you have to use for each article when the project is awarded. But the basic topics are automobiles, web design, SEO and sports. I am looking for a long term copywriting solution, so I hope things work out well with this trial run.