articles for 4 websites

Hi, I need 26 high quality articles for my websites, Articles should follow these guidelines: Articles should be 400-500 words Articles need to be done within 10 days of bid assignment All articles should be 100% unique Must be written in perfect English, with perfect grammar and spelling You will have no right to reissue or reuse the work as all the copyrights would belong to me Bidders without sample will not be considered. Payment will be made after submission and review of articles you must to include related keywords( these will be supplied ) All articles written must have the following components: 1. Article Summary (2-3 sentences) 2. Article Body (400-500 words) Thanks