Drop y, add ies

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Across
  1. 3. try
  2. 6. copy
  3. 9. lolly
  4. 10. party
  5. 11. cities
  6. 12. baby
Down
  1. 1. fly
  2. 2. army
  3. 4. duty
  4. 5. worry
  5. 7. jelly
  6. 8. puppy
  7. 9. lorry