19. No crocodiles are amiable when hungry.
20. Some crocodiles, when not hungry, are amiable; but some are not.
21. No crocodiles are amiable, and some are hungry.
22. All crocodiles, when not hungry, are amiable; and all unamiable crocodiles are hungry.
23. Some hungry crocodiles are amiable, and some that are not hungry are unamiable.
[See pp. 63, 4]
5. Smaller Diagram.
Symbols to be interpreted.
__________
-----------
| | |
| x |
|--y--|--y'-|
| x' |
| | |
-----------