A
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A bears traces of corrections of the L.H. part in those bars. One can be almost certain that originally bar 18 began with the crotchet F , other changes - on the 2nd beat of bar 18 and at the beginning of bar 19 - are more difficult to decipher.
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category imprint: Corrections & alterations; Source & stylistic information
issues: Corrections in A, Accompaniment changes
notation: Pitch