user-agent: Baiduspider
                    Disallow: /
                    User-agent: Yandex
                    Disallow: /
                    User-agent: *
                    User-agent: Siteimprove
                    Crawl-delay: 20
                    User-agent: Siteimprovebot
                    Crawl-delay: 20
                    User-agent: Siteimprovebot-crawler
                    Crawl-delay: 20