User-agent: Googlebot-Image
Disallow: /

User-agent: Googlebot-Mobile
Disallow: /

User-agent: Mediapartners-Google
Disallow: /

User-agent: Adsbot-Google
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User-Agent: Googlebot
Disallow: /forum/
Allow: /forum/index.php
Allow: /forum/viewforum.php
Allow: /forum/viewtopic.php