ir, ire, ier

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Across
  1. 2. first
  2. 5. fire
  3. 6. skirt
  4. 7. bird
  5. 9. tire
  6. 10. girl
  7. 11. thirst
  8. 13. drier
Down
  1. 1. wire
  2. 3. their
  3. 4. birth
  4. 6. shirt
  5. 8. dirt
  6. 12. third