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5.454

In logic there is no side by side, there can be no classification.

In logic there cannot be a more general and a more special.

5.4541

The solution of logical problems must be neat for they set the standard of neatness.

Men have always thought that there must be a sphere of questions whose answers -- a priori -- are symmetrical and united into a closed regular structure.

A sphere in which the proposition, simplex sigillum veri, is valid.