Note the different note values of the 7 stroke rolls in US notation (8a), Berger notation (8b), and Zündstoff notation (8c).
8a (US) and 8b (Berger): Not dotted 8th notes that are counting in the bars note value.
8c (Zündstoff): Dotted 8th notes that are not counting in the bars note value.
Therefor, and to comply with the 2/4 time signature, some of the flams are written as 4th instead of 8th notes.
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