The Great Fantastic Fun Prefix Group One Extravaganza

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Across
  1. 4. test before the real one
  2. 6. a camera stand with three legs
  3. 8. not continued
  4. 11. a zoomer with two eye holes
  5. 15. moving something across the ocean
  6. 16. replacing something in body
  7. 17. remove numbers
  8. 18. bike with one of the wheels
  9. 19. moving something out of where it is
Down
  1. 1. everyone coming together as one
  2. 2. person above you
  3. 3. before the root
  4. 5. boat underwater
  5. 7. two years
  6. 9. leave
  7. 10. after war
  8. 12. something above natural
  9. 13. not agreeing
  10. 14. after the date
  11. 16. bike with three wheels