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Crawl-Delay: 15

User-agent: psbot
Crawl-delay: 15 

User-agent: voyager
Crawl-delay: 15 

User-agent: Sogou spider
Crawl-delay: 15 

User-agent: Sogou 
Crawl-delay: 15 

User-agent: Googlebot 
Crawl-delay: 15 

User-agent: Slurp 
Crawl-delay: 15