11

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Across
  1. 3. - Ancient counting device
  2. 4. - Circus performer
  3. 6. - Large seabird
  4. 8. - African burrowing mammal
  5. 10. - Monastery or convent
Down
  1. 1. - Flying machine
  2. 2. - Ridiculously unreasonable
  3. 5. - Agreement or harmony
  4. 7. - On fire
  5. 9. - Medieval chemistry