User-agent: Webalta
Disallow: /

User-agent: Spinn3r
Disallow: /

User-agent: Mail.Ru
Disallow:
Crawl-delay: 60

User-agent: Dolphin
Disallow: /

User-agent: WebAlta Crawler
Disallow: /

User-agent: Slurp
Disallow: /

User-agent: * 
Crawl-delay: 20