LOGIC

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Across
  1. 2. ⋅
  2. 4. x'
  3. 7. or
  4. 8. if and only if (iff)
  5. 9. negation
  6. 11. |
  7. 12. ∀
  8. 13. not - negation
  9. 14. ^
Down
  1. 1. ⇒
  2. 2. &
  3. 3. ∃
  4. 5. ∨
  5. 6. ¬
  6. 10. ∴