The omission of the 
indication at the beginning of the bar in FE (→GE1,EE1) can be intentional, hence we do not include it in the main text. In GE2 (→GE3→GE4) and EE2 the indication was added, most probably on the basis of comparison with analogous bar 51.
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category imprint: Differences between sources; Corrections & alterations
issues: EE revisions, GE revisions, Authentic corrections of FE
notation: Verbal indications