As includes two written versions of bar 4 – in the main course of the text it features the version with e1 as the bottom note of all dyads in the R.H. and the g
-c1 fourth as the 2nd crotchet in the L.H. and above one can see the version with f1 and the g-d1 fifth. Bar 20 is not written out in As, hence it is meant to be the same as bar 4. We adopt the first, undoubtedly earlier, version to be the text of As, since the second became the final one (not including the rhythm). It cannot be excluded that the second version was added not in the first phase of writing the Waltz, yet later, even after having written AI, in which the part of the L.H. still conserved its original shape (the g-c1 fourth), whereas in the part of the R.H. in bar 4 one can see a correction from the original version.
Compare the passage in the sources»
category imprint: Differences between sources; Corrections & alterations
issues: Corrections of AI
notation: Pitch