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Across
  1. 4. Absolutely necessary
  2. 5. Unavoidable
  3. 7. Coordinated, harmonious
  4. 8. Adaptation, modification
  5. 10. Someone’s general attitude, mentality
  6. 12. Relatively
  7. 13. Clear
Down
  1. 1. Ready, prepared
  2. 2. Result, outcome
  3. 3. Novelty, something new
  4. 5. Seldom
  5. 6. A sudden increase
  6. 9. Holding, keeping, restraining
  7. 11. Maximum, extreme, ultimate