# Allow Google, Yahoo and Bing to crawl all beside of /admin/
User-agent: Googlebot 
User-agent: Yahoo! Slurp
User-agent: msnbot
User-agent: AhrefsSiteAudit
Disallow: /admin/ 
Disallow: /analitics/
Disallow: /class/
Allow: / 

# Disallow all other to crawl everywhere
User-agent: * 
Disallow: /