Trial of Knowledge

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Across
  1. 4. Never gonna give you up...
  2. 6. LXIX
  3. 7. When letters appear in math
  4. 9. &
  5. 10. The organ in the alphabet
Down
  1. 1. This trial
  2. 2. The best players in chess
  3. 3. An animal and a sin
  4. 5. There's the first, second, third and mixed
  5. 8. An edible computer brand