FC
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It seems that the title written in FCI was not added later; therefore, Fontana already knew the name of the piece and its position in the entire cycle at the time of writing (however, it does not prejudge the title of Chopin's autograph). Consequently, the copy comes from the time when Chopin already had a clear vision of the cycle of preludes and was working on completing them.
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category imprint: Differences between sources
notation: Verbal indications