[5]
As regards the epicheieme, some authorities hold
that it consists of four, five, and even six parts.
Cicero1 urges that there are not more than five at
most, i.e. the major premise and its reason, the minor
premise and its proof, and fifthly the conclusion.
But since at times the major premise does not
require a reason nor the minor a proof, while
occasionally even the conclusion is not necessary,
he holds that the epicheireme may consist of only
four, three, or even two parts.
1 de Inv. I. xxxvii. 67.
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