'os' middle

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Across
  1. 4. a musical instrument with keys
  2. 6. more than one combination of pairs
  3. 7. when one person takes control
  4. 9. telling others to quieten down
  5. 10. a nocturnal animal
Down
  1. 1. bones of a deceased creature
  2. 2. a musical instrument with strings
  3. 3. permanent markings made on skin with ink
  4. 5. houses made of ice blocks
  5. 8. animals in captivity are kept here for display