User-agent: psbot/0.1
Disallow: /

User-agent: NimbleCrawler
Disallow: /

User-agent: linksmanager
Disallow: /

User-agent: BecomeBot 
Disallow: /

User-agent: Gigabot 
Disallow: /

User-agent: Charlotte/1.0b
Disallow: /

User-agent: Charlotte
Disallow: /

User-agent: Snapbot
Disallow: /

User-agent: *
Disallow: