-------
| | | i.e. Some x' are y'. i.e. Some birds,
8. |---|---| that are not well-fed, are unhappy;
| | 1 | or, Some unhappy birds are not
------- well-fed.
-------
| 1 | 0 |
9. |---|---| i.e. All x are y. i.e. John has got a
| | | tooth-ache.
-------
-------
| | |
10. |---|---| i.e. No x' are y. i.e. No one, but John,
| 0 | | has got a tooth-ache.
-------