Capital cities crossword

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Across
  1. 5. Rome
  2. 6. Vienna
  3. 9. London
  4. 10. Brussels
  5. 11. Belgrade
  6. 12. Petrograd
Down
  1. 1. Constantinople
  2. 2. Ottawa
  3. 3. Paris
  4. 4. Sofia
  5. 7. Bucharest
  6. 8. Washington, D.C.