User-agent: Gigabot
Disallow: /

User-agent: BecomeBot 
Disallow: /

User-agent: MJ12bot
Disallow: /

User-agent: Snapbot
Disallow: /

User-agent: NextGenSearchBot
Disallow: /

User-agent: *
Disallow: /cgi-bin/
Disallow: /admin/
Disallow: /images/
Disallow: /extensions/