User-agent: *
Disallow: /about/contact.html

User-agent: *
Disallow: /about/contact2.html

User-agent: *
Disallow: /about/boardreg.html

User-agent: twiceler
Disallow: /

User-agent: Yandex
Disallow: /

User-agent: dotbot 
Disallow: / 

User-agent: AhrefsBot
Disallow: /

User-agent: MJ12bot
Disallow: /

User-agent: Baiduspider
Disallow: /

User-agent: BLEXBot
Disallow: /

User-agent: SemrushBot
Disallow: /

User-agent: SemrushBot-SA
Disallow: /