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You're free to use whatever you'd like, however, posts found in the _drafts or _posts folder are copyright of Timothy B. Smith, and may not be used without proper attribution. Of course, the logo is also my copyright… you know what you can copy/paste and what you shouldn't. Be nice.
Thanks for your interest in contributing! I invite you to read the comprehensive guide to contributing. You'll find info on how to get the site working locally, and special YAML front matter you'll need.