Crawl-delay: 20

User-agent: dotbot
Disallow: / 

User-agent: baiduspider
Disallow: /

User-agent: Yandex
Disallow: /

User-agent: twiceler
Disallow: /

User-agent: *
Disallow: /variantsled.php
Disallow: /tarp.php
Disallow: /aafile.html
Disallow: /zafile.html
Disallow: /nofile.html
Disallow: /plugins/