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The double bar line in A separates the upbeat of the 2nd part of this variation, which does not result here from the musical substance itself – cf. the more noticeable divisions in the theme and in variations I and III. Chopin was not consistent in indicating this division – a double bar line before the 4th quaver in the bar is present only in the theme (in A and the editions) and in variation III (in AsI).
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