NOT SO HARD

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Across
  1. 2. EGYPT'S CAPITAL
  2. 3. IT GROWS FROM LITTLE ACORNS
  3. 8. UNITED AND CITY
  4. 9. A BREED OF DOG
  5. 11. HEADGEAR
  6. 13. THE MOUNTAIN ASH
  7. 15. ROBIN THE OUTLAW
Down
  1. 1. FARM VEHICLE
  2. 4. US INDIAN TRIBE
  3. 5. US SPORT
  4. 6. SYMBOL OF AMERICA
  5. 7. A WRITING IMPLEMENT
  6. 10. A TYPE OF HAT
  7. 12. A MAKE OF CAR
  8. 14. THE SMOKERS TREE?