For students who enjoy the complexities of analytical syllogistics, here follow some theoretical questions whose answers can all be derived from the systematic application of the six rules of the syllogism set forth in Section 6.4. Answering these questions will be much easier if you have fully grasped the deduction of the fifteen valid syllogistic forms presented in this Appendix.

In what mood or moods, if any, can a second-figure standard-form categorical syllogism with a universal conclusion be valid?