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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Euthydemus by Plato: examples in the Sophist and Statesman; a scheme of categories is found in
the Philebus; the true doctrine of contradiction is taught, and the fallacy
of arguing in a circle is exposed in the Republic; the nature of synthesis
and analysis is graphically described in the Phaedrus; the nature of words
is analysed in the Cratylus; the form of the syllogism is indicated in the
genealogical trees of the Sophist and Statesman; a true doctrine of
predication and an analysis of the sentence are given in the Sophist; the
different meanings of one and being are worked out in the Parmenides. Here
we have most of the important elements of logic, not yet systematized or
reduced to an art or science, but scattered up and down as they would
naturally occur in ordinary discourse. They are of little or no use or
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