prefix and affix

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Across
  1. 2. deduce
  2. 4. apart
  3. 7. wrong
  4. 8. back
  5. 10. lacking
  6. 11. all
  7. 12. under
  8. 15. higher
  9. 17. upon
  10. 19. before
Down
  1. 1. toward
  2. 3. equally
  3. 4. abnormal
  4. 5. against
  5. 6. across
  6. 7. one
  7. 9. around
  8. 13. two
  9. 14. apart
  10. 16. again
  11. 18. among