User-agent: Googlebot
Disallow: /sistema
User-agent: Slurp
Disallow: /sistema
User-agent: MSNBot
Disallow: /sistema
User-agent: Googlebot-Image
Disallow: /sistema
User-agent: yahoo-mmcrawler
Disallow: /sistema
User-agent: psbot
Disallow: 
User-agent: *
Disallow: /sistema