| 11. | Pure ratiocination occurs by means of three propositions.
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| 12. | Mixed ratiocination occurs by more than three propositions.
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| 13. | A mixed ratiocination is still a single ratiocination.
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| 14. | A mixed ratiocination is still a single ratiocination.
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| 15. | A mixed ratiocination interposes an immediate inference, resulting in more than three propositions.
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| 16. | There must be clues and the puzzle is solved by ratiocination, some cerebral thought.
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| 17. | Poe called this story " perhaps, the best of my tales of ratiocination ".
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| 18. | Because proof is possible only through ratiocination, these rules can't be proved.
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| 19. | Without it, the ratiocination is invalid.
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| 20. | However, it can be shown that these rules are the primary, universal rules of all ratiocination.
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