Writing SEO Articles

I require several (10-30) articles written per week on assorted topics (actual number will depend primarily on contractor's reliability and quality level), optimized for SEO by inserting key words which I will select. Requirements for articles: 1. 400-600 words per article 2. 4-6 uses of three keywords/exact phrases which I will provide, and perhaps brief guidance as to tone. 3. Near-perfect grammar, diction and phrasing. These will be proof-read, but not substantially re-written. That's your job. 4. Articles must be written by human contractor - no automation or spinning. 5. Completely original, new and purpose-written for this project: multiple plagiarism detectors will be applied. 6. North American English grammar/diction/vocabulary/spelling conventions. Cannot sound colonial or broken. 7. Fluent, educated diction & tone. 8. Delivered in MS Word format via email (anonymous document properties), .doc (NOT .docx), one article per file. 9. Will need to briefly note article completion in my accounting system via web form. Native English speaker is preferred; Skilled is an absolute job requirement. I will work with anyone with the ability, but I cannot correct significant broken English, colonial diction. Must have HIGH-LEVEL WRITTEN language skills. Speaking is not writing. Colloquial language is not appropriate for work in print. A professional editor must be able to get each submission into shape for publication within 5 minutes. Please Quote prices PER ARTICLE, for delivery Thursday 8/23 by 10PM Eastern Time (US). Initial job will consist of 10 articles. Please bid at this amount (10 articles delivered in 6 days). For future jobs, the corresponding per-article rate will be assumed. Single top-qualified bidder will have their grammar and mastery tested by editing a short article; This will be paid as part of the job if it passes muster.