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In GE2 the 
sign is unclear: it is unknown whether the second was badly removed by the revisers or whether it was poorly printed. Probably due to this reason GE3 removed one sign, leaving erroneously only a single (b
1). B
1 was returned in GE4 (→GE5).
Compare the passage in the sources »
category imprint: Graphic ambiguousness; Differences between sources
issues: Inaccuracies in GE, Errors in GE
notation: Pitch