| Paragraph 1 | When one thing is predicated of another, all that which is predicable of the predicate will be predicable also of the subject. |
| Paragraph 2 | If genera are different and co-ordinate, their differentiae are themselves different in kind. |
| Paragraph 3 | But where one genus is subordinate to another, there is nothing to prevent their having the same differentiae: |

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created 1996/11/25 modified 2009/04/26