In A one can see that Chopin initially wrote the mordent with a conventional 
mark. In the grace notes added instead of , the 
before c
2 merged with the arpeggio sign, resulting in a mark resembling a 
. Consequently, in FE (→EE1) the 2nd grace note is c2. Chopin reacted to this mistake in FES by adding a in pencil (which Miss Stirling later wrote in ink). The correct text is also to be seen in EE2, probably on the basis of GE1.
In this place, FCI includes an earlier version – there are no ornaments on the 4th quaver in the bar, while b1 is linked with a tie to the dotted crotchet at the beginning of the bar.
Compare the passage in the sources»
category imprint: Differences between sources; Corrections & alterations; Source & stylistic information
issues: Annotations in teaching copies, EE revisions, Errors in FE, Corrections in A, Errors resulting from corrections, Deletions in A, Annotations in FES, Main-line changes, Inaccuracies in A
notation: Ornaments