The Ship of Theseus Paradox

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Across
  1. 2. A ship or large boat.
  2. 3. A part or element of a larger whole.
  3. 6. The fact of being who or what a person or thing is.
  4. 9. Direct descent from an ancestor; ancestry.
  5. 11. Sharp, severe, or showing perceptive understanding.
  6. 14. Relating to both space and time.
  7. 15. A confusing and difficult problem or question.
  8. 17. An exact copy or model of something.
  9. 18. Reasoning conducted according to strict principles.
  10. 19. Understanding something instinctively.
Down
  1. 1. Causing worry, frustration, or annoyance.
  2. 3. Unbroken and consistent existence or operation.
  3. 4. Relevant or applicable to a particular matter.
  4. 5. Lasting for a long time; enduring or recurring.
  5. 7. Mythical creature, part man, part bull.
  6. 8. A seemingly absurd or self-contradictory statement that may be true.
  7. 10. Relating to the fundamental nature of reality.
  8. 12. The intrinsic nature or indispensable quality of something.
  9. 13. A long, thin, flat piece of timber.
  10. 16. Dealing with things sensibly and realistically.