User-agent: YandexBot # will be used only by the main indexing robot
Disallow: /

User-agent: Yandex # will be used by all Yandex robots
Disallow: /

User-agent: Yandex # will be used by all Yandex robots
Disallow: /

User-agent: SemrushBot
Disallow: /

User-agent: SemrushBot-SA
Disallow: /