User-agent: * 
Crawl-Delay: 20

User-agent: *
Disallow: /admin

User-agent: BaiduSpider
Disallow: /
User-agent: DotBot
Disallow: /
User-agent: PetalBot
Disallow: /
User-agent: CriteoBot
Disallow: /
User-agent: SemrushBot
Disallow: /
User-agent: MJ12bot
Disallow: /
User-agent: AhrefsBot
Disallow: /
User-agent: YandexBot
Disallow: /
User-agent: Microsoft.URL
Disallow: /
User-agent: MSNBot
Disallow: /
User-agent: GrapeshotCrawler
Disallow: /
User-agent: MojeekBot
Disallow: /
User-agent: SeznamBot
Disallow: /