A simple strategy for happiness

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Across
  1. 3. accidentally
  2. 4. opportunities
  3. 6. react
  4. 9. significantly
  5. 11. proposal
Down
  1. 1. fallback
  2. 2. nullified
  3. 5. cooperative
  4. 7. achievement
  5. 8. boost
  6. 10. Synonym