1. :nth-child(8n+1)
2. :nth-child(8n+2)
3. :nth-child(8n+3)
4. :nth-child(8n+4)
5. :nth-child(8n+5)
6. :nth-child(8n+6)
7. :nth-child(8n+7)
8. :nth-child(8n+8)
9. :nth-child(8n+1)
10. :nth-child(8n+2)
11. :nth-child(8n+3)
12. :nth-child(8n+4)
13. :nth-child(8n+5)
14. :nth-child(8n+6)
15. :nth-child(8n+7)
16. :nth-child(8n+8)