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use of the Eulerian scheme."

But nevertheless, he contended, "the inapplicability of this scheme for the purposes of a really general logic" and then noted that,
: "It fits in, but badly, even with the four propositions of the common logic to which it is normally applied."

Venn ends his chapter with the observation illustrated in the examples below--that their use is based on practice and intuition, not on a strict algorithmic practice:
:

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