Spelling contract

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Across
  1. 3. to change from one form to another
  2. 5. a evil or wicked character/person
  3. 6. having a strong effect
  4. 9. to give up
  5. 11. a violent attack
Down
  1. 1. giving good results
  2. 2. tending to give the wrong idea
  3. 4. great in numbers
  4. 7. a plan
  5. 8. to give good reasons for
  6. 10. an argument
  7. 12. showing clever judgement