Select: 
Category
All
Graphic ambiguousness
Interpretations within context
Differences between sources
Editorial revisions
Corrections & alterations
Source & stylistic information
Shorthand & other
All
Pitch
Rhythm
Slurs
Articulation, Accents, Hairpins
Verbal indications
Pedalling
Fingering
Ornaments
Shorthand & other
Importance
All
Important
Main


Shorthand & other

b. 312

composition: Op. 21, Concerto in F minor, Mvt I

..

In A the 3rd group of semiquavers is written in an abbreviated manner as a repetition of the second one.

category imprint: Source & stylistic information

issues: Abbreviated notation of A