Taking "crocodiles" as Universe; x="hungry"; and y="amiable";
a. All hungry crocodiles are unamiable.
b. No crocodiles are amiable when hungry.
c. Some crocodiles, when not hungry, are amiable; but some are not.
d. No crocodiles are amiable, and some are hungry.
e. All crocodiles, when not hungry, are amiable; and all unamiable crocodiles are hungry.
f. Some hungry crocodiles are amiable, and some that are not hungry are unamiable.
Symbols to be interpreted.
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| x |
|--y--|--y'-|
| x' |
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1. |---|---| 2. |---|---|
| 1 | | | | 0 |
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| | 1 | | | |
3. |---|---| 4. |---|---|
| | 0 | | 0 | 0 |
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(Lewis Carrol, The Game of Logic)