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User-agent: AhrefsBot
Crawl-Delay: 20

User-agent: AhrefsSiteAudit
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User-Agent: MauiBot
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User-agent: MJ12bot
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User-agent: Bytespider
Disallow: /

User-agent: BLEXBot
Disallow: /

User-agent: PetalBot
Disallow: /

User-agent: sogou spider
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User-agent: Sogou web spider
Disallow: /

User-agent: Sogou inst spider
Disallow: /