balancing equations

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Across
  1. 4. Proved
  2. 6. Letter
  3. 9. Bad
  4. 10. Front
Down
  1. 1. of Conservation Cannot
  2. 2. Good
  3. 3. After
  4. 5. Number
  5. 7. Anything
  6. 8. Before
  7. 11. Science