User-agent: *
Disallow: /mb/

User-agent: *
Disallow: /bulletin/

User-agent: ia_archiver
Disallow: /mb/

User-agent: Slurp
Disallow: /mb/

User-agent: Googlebot
Disallow: /mb

User-agent: Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
Disallow: /mb

User-agent: Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp)
Disallow: /mb/