What are the groups in 1?

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  1. #eighth
  2. #second
  3. #fourth
  4. #standard
  5. #groups
  6. #think
  7. #seventh
  8. #about
  9. #number
  10. #sixth
  11. #convention
  12. #first
  13. #columns
  14. #fifth
  15. #group
  16. #third
  17. #column
  18. #table
  19. #simple
  20. #periodic