/x/ sound

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Across
  1. 1. a musical instrument sounded by striking with wooden hammers
  2. 4. the act of going out or away
  3. 6. very good of its kind
  4. 8. the upper limit
  5. 9. a preparation given to increase immunity
  6. 11. satisfactory completion of something
  7. 12. to receive or take willingly
  8. 14. permission or power to enter
Down
  1. 2. traveling at high speed
  2. 3. a combination of two or more substances
  3. 5. the feel and appearance of something
  4. 7. fear or nervousness about what might happen
  5. 10. providing great accuracy
  6. 13. a charge of money set by the government