The structure of the Invention no. 4 is similar to a fugue with presentations of the subject connected by episodes.

Subject presentation or exposition	Measures 1 to 5	D minor
Episode	Measures 5 to 18	From D minor to F major
Subject presentation in F major and A minor followed by episodes	Measures 18 to 38	From F major to A minor
Last subject presentation	Measures 38 to 52	G minor, F major and D minor
Complete Invention

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