Ordinal numbers

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123456789101112131415161718
Across
  1. 2. 2nd
  2. 3. 6th
  3. 5. 17th
  4. 8. 15th
  5. 9. 18th
  6. 12. 12th
  7. 15. 10th
  8. 16. 13th
  9. 17. 14th
  10. 18. 3rd
Down
  1. 1. 11th
  2. 2. 16th
  3. 4. 1st
  4. 6. 8th
  5. 7. 7th
  6. 10. 19th
  7. 11. 4th
  8. 13. 20th
  9. 14. 9th
  10. 17. 5th