Max's birthday crossword

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Across
  1. 1. Under.
  2. 5. Hints.
  3. 6. Manifold/numerous.
  4. 7. 3600 of these make up an hour.
  5. 10. The number for which division and multiplication are interchangeable.
  6. 13. Similar in characteristics.
  7. 14. Not that.
  8. 15. Came from, had its source in.
  9. 17. About, concerning.
  10. 19. Exist.
  11. 20. Except.
  12. 21. A Batman villain.
  13. 22. Occuring before the others.
  14. 24. Husks, armors.
  15. 25. Firm, hard.
  16. 27. Specific definite article.
Down
  1. 2. All.
  2. 3. Draft, author.
  3. 4. Was capable of.
  4. 8. Buddies, social friends.
  5. 9. A unique prime number.
  6. 11. Subsequent, following in the sequence.
  7. 12. Has.
  8. 16. Our planet's midline.
  9. 18. Conundrum, puzzle.
  10. 23. One of the smallest prime numbers.
  11. 26. Not light.