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Disallow: /img/*.gif$
Disallow: /img/*.jpg$ 
Disallow: /img/imgcontent/*.gif$
Disallow: /img/imgcontent/*.jpg$ 
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User-agent: Slurp
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Disallow: /images/*.jpg$
Disallow: /images/*.gif$
Disallow: /img/*.gif$
Disallow: /img/*.jpg$