User-agent: *
Crawl-Delay: 20

User-agent: baiduspider
Disallow: /

User-agent: NaverBot
Disallow: /

User-agent: Twiceler
Disallow: /

User-agent: LiteFinder
Disallow: /

User-agent: LinkWalker
Disallow: /

User-agent: Site-Patrol
Disallow: /