User-Agent: *
Disallow:

User-agent: BingBot
Crawl-delay: 20

User-agent: SemrushBot
Crawl-delay: 20

User-agent: AhrefsBot
Crawl-delay: 20

User-agent: MJ12bot
Crawl-delay: 20

User-agent: Pingdom.com_bot_version_1.4
Crawl-delay: 20