User-agent: Yeti/0.01
Disallow: /

User-agent: Yeti
Disallow: /

User-agent: Naver
Disallow: /

User-agent: naver
Disallow: /

User-agent: nhn
Disallow: /

User-agent: NHN
Disallow: /

User-agent: *naver*
Disallow: /