How does sewage flow uphill?

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  1. #pitched
  2. #through
  3. #called
  4. #under
  5. #slight
  6. #parallel
  7. #angle
  8. #force
  9. #gravity
  10. #until
  11. #allow
  12. #switch
  13. #sewer
  14. #activated
  15. #water
  16. #waste
  17. #street
  18. #wastewater
  19. #again
  20. #uphill
  21. #pumps