Numbers to twenty

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Across
  1. 3. twenty
  2. 4. five
  3. 6. seventeen
  4. 7. nine
  5. 8. eleven
  6. 9. fourteen
  7. 11. eight
  8. 13. nineteen
  9. 16. seven
  10. 17. thirteen
  11. 18. one
  12. 19. six
Down
  1. 1. sixteen
  2. 2. twelve
  3. 4. fifteen
  4. 5. ten
  5. 10. eighteen
  6. 12. three
  7. 14. four
  8. 15. two