In A (→FE1) there are no accidentals in the 2nd half of bar 87 nor in the 2nd triplet in bar 88. They are inaccuracies, typical of Chopin, resulting from his habit of omitting 'obvious' accidentals when repeating schematic figures based on one chord (bar 87) or from the conviction that the accidentals are valid in spite of the use of an octave sign (bar 88). In FE2 a 
was added to a1 in the 3rd chord in bar 87 and to a2 in bar 88. EE and GE include all the necessary accidentals.
Compare the passage in the sources»
category imprint: Interpretations within context; Differences between sources
issues: EE revisions, Accidentals in different octaves, GE revisions, FE revisions, Inaccuracies in A, Errors repeated in FE
notation: Pitch