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Full Idea
Stoics say rhetoric is tripartite. Part is deliberative, part forensic, part encomiastic. It is divided into invention, diction, organisation, and delivery. Rhetorical speech is divided into the introduction, exposition, counterargument and conclusion.
Gist of Idea
Rhetoric has three types, four modes, and four sections
Source
report of Stoic school (fragments/reports [c.200 BCE]) by Diogenes Laertius - Lives of Eminent Philosophers 07.42-3
Book Ref
'The Stoics Reader', ed/tr. Inwood,B/Gerson,L.P. [Hackett 2008], p.11
A Reaction
The last bit is quite a good guide for a philosophical paper.