Super Stems

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Across
  1. 2. polygon
  2. 4. incision
  3. 5. trifecta
  4. 6. semitone
  5. 13. nonprofit
  6. 14. century
Down
  1. 1. anthropoid
  2. 3. postpone
  3. 5. symbol
  4. 7. photograph
  5. 8. credit
  6. 9. symphony
  7. 10. dismiss
  8. 11. videotape
  9. 12. refer