FE
compare
in 
In the version for publication the dynamics of the Etude remains undefined until bar 26. Although Chopin could have accepted this state of affairs, it seems right to give the hint written in A (in a variant form) in the main text.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Inaccuracies in FE, No initial dynamic marking
notation: Verbal indications