User-agent: googlebot 
Disallow:

User-agent: Slurp 
Disallow:
Crawl-delay: 10 

User-agent: msnbot 
Disallow:
Crawl-delay: 50 

User-agent: dotbot
Disallow: /

User-agent: Purebot
Disallow: /

User-agent: Speedy
Disallow: /

User-agent: * 
Crawl-delay: 100