User-agent: * 
Allow: / 

User-agent: Googlebot
Crawl-Delay: 1

User-agent: Yandex
Crawl-Delay: 10

User-agent: YandexBot 
Crawl-Delay: 10

User-agent: Bingbot 
Crawl-Delay: 2

User-agent: msnbot
Crawl-delay: 30

User-agent: Slurp 
Crawl-Delay: 30

User-agent: DuckDuckBot 
Crawl-Delay: 30

User-agent: Baiduspider 
Crawl-Delay: 30

User-agent: facebot 
Crawl-Delay: 20

User-agent: ia_archiver 
Crawl-Delay: 3