User-agent: AhrefsBot 
Disallow: / 

User-agent: MJ12bot 
Disallow: / 

User-agent: rogerbot 
Disallow: /

User-agent: *
Disallow: /wp-admin/
Disallow: /wp-includes/
Disallow: /author/
Allow: /*.js$
Allow: /*.css$
Crawl-Delay: 20