User-agent: *
Disallow: /extra

User-agent: Googlebot
Disallow: /extra
Disallow: /*PHPsessid 
Disallow: /?artikel*PHPSESSID

User-agent: Googlebot-Image
Disallow: /extra
Disallow: /*PHPsessid 

User-agent: Googlebot-Mobile
Disallow:/extra
Disallow: /*PHPsessid 

User-agent: Adsbot-Google
Disallow:/extra
Disallow: /*PHPsessid 

User-agent: Mediapartners-Google
Disallow:/extra
Disallow: /*PHPsessid