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User-agent: Amazonbot
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#petalbot	https://webmaster.petalsearch.com/site/petalbot
User-agent: PetalBot
Disallow: /

#AhrefsBot	http://ahrefs.com/robot/
User-agent: AhrefsBot
Disallow: /

#SemrushBot	http://www.semrush.com/bot.html
User-agent: SemrushBot
Disallow: /