User-agent: YandexDirect
Allow: /a/
Allow: /b/
Allow: /c/

User-agent: Yandex
Disallow: /a/
Disallow: /b/
Disallow: /c/

User-agent: YandexAdditionalBot
Disallow: /a/
Disallow: /b/
Disallow: /c/

User-agent: Googlebot
Disallow: /a/
Disallow: /b/
Disallow: /c/

User-agent: AdsBot-Google
Allow: /a/
Allow: /b/
Allow: /c/

User-agent: Google-Extended
Disallow: /a/
Disallow: /b/
Disallow: /c/

User-agent: *
Disallow: /a/
Disallow: /b/
Disallow: /c/