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User-agent: bingbot
Disallow: /

User-agent: Googlebot
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User-agent: GoogleAssociationService
Disallow: /

User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36 Google-PageRenderer Google (+https://developers.google.com/+/web/snippet/)
Disallow: /