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Across
  1. 3. able to be defended with logic or justification; valid
  2. 7. Someone who teaches you things
  3. 8. The quality or state of being correct or precise
Down
  1. 1. a thing made or adapted for a particular purpose, especially a piece of mechanical or electronic equipment
  2. 2. moral principles that govern a person's behaviour or the conducting of an activity
  3. 4. Chat-
  4. 5. help, typically of a practical nature
  5. 6. Widespread destruction