User-agent: *
Disallow: /ost/
Disallow: /ost1/
Disallow: /ost2/
Disallow: /ost3/
Disallow: /ost4/
Disallow: /ost5/
Disallow: /ost6/
Disallow: /ost7/
Disallow: /ost8/
Disallow: /ost9/
Disallow: /ost10/
Disallow: /ost11/
Disallow: /ost12/