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The Game of Logic by Lewis Carroll
page 22 of 121 (18%)
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| 0 | | All y are x';
| | | i.e. All nice are not-new.
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This may be taken to be a cupboard divided in the same way as the
last, but ALSO divided into two portions, for the Attribute m. Let
us give to m the meaning "wholesome": and let us suppose that all
WHOLESOME Cakes are placed INSIDE the central Square, and all the
UNWHOLESOME ones OUTSIDE it, that is, in one or other of the four
queer-shaped OUTER compartments.

We see that, just as, in the smaller Diagram, the Cakes in each
compartment had TWO Attributes, so, here, the Cakes in each compartment
have THREE Attributes: and, just as the letters, representing the
TWO Attributes, were written on the EDGES of the compartment, so,
here, they are written at the CORNERS. (Observe that m' is supposed
to be written at each of the four outer corners.) So that we can
tell in a moment, by looking at a compartment, what three Attributes
belong to the Things in it. For instance, take No. 12. Here we
find x, y', m, at the corners: so we know that the Cakes in it, if
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