User-agent: twiceler
Disallow: /
User-agent: psbot
Disallow: /
User-agent: MJ12bot
Disallow: /
User-agent: Mp3Bot
Disallow: /
User-agent: discobot
Disallow: / 
User-agent: YodaoBot
Disallow: / 
User-agent: *
Crawl-delay: 20